diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/ScalaAkkaHttpServerCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/ScalaAkkaHttpServerCodegen.java
index c46341ec5800..4b98b531b262 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/ScalaAkkaHttpServerCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/ScalaAkkaHttpServerCodegen.java
@@ -251,7 +251,7 @@ public CodegenParameter fromParameter(Parameter parameter, Set<String> imports)
             param.dataType = "String";
         }
         if (!param.required) {
-            param.vendorExtensions.put("hasDefaultValue", param.defaultValue != null);
+            param.vendorExtensions.put("x-has-default-value", param.defaultValue != null);
             // Escaping default string values
             if (param.defaultValue != null && param.dataType.equals("String")) {
                 param.defaultValue = String.format(Locale.ROOT, "\"%s\"", param.defaultValue);
@@ -324,7 +324,7 @@ protected static void addPathMatcher(CodegenOperation codegenOperation) {
         }
         pathMatchers.getLast().hasMore = false;
 
-        codegenOperation.vendorExtensions.put("paths", pathMatchers);
+        codegenOperation.vendorExtensions.put("x-paths", pathMatchers);
     }
 
     public static String PATH_MATCHER_PATTERNS_KEY = "pathMatcherPatterns";
@@ -409,11 +409,11 @@ public static void marshallingPostProcessor(Map<String, Object> objs) {
                         entityMarshallerTypes.add(marshaller);
                         operationSpecificMarshallers.add(marshaller);
                     }
-                    response.vendorExtensions.put("isDefault", response.code.equals("0"));
+                    response.vendorExtensions.put("x-is-default", response.code.equals("0"));
                 }
-                op.vendorExtensions.put("specificMarshallers", operationSpecificMarshallers);
-                op.vendorExtensions.put("fileParams", fileParams);
-                op.vendorExtensions.put("nonFileParams", nonFileParams);
+                op.vendorExtensions.put("x-specific-marshallers", operationSpecificMarshallers);
+                op.vendorExtensions.put("x-file-params", fileParams);
+                op.vendorExtensions.put("x-non-file-params", nonFileParams);
             }
         }
 
diff --git a/modules/openapi-generator/src/main/resources/scala-akka-http-server/api.mustache b/modules/openapi-generator/src/main/resources/scala-akka-http-server/api.mustache
index 0fcceddbbfc4..cc9e7b690399 100644
--- a/modules/openapi-generator/src/main/resources/scala-akka-http-server/api.mustache
+++ b/modules/openapi-generator/src/main/resources/scala-akka-http-server/api.mustache
@@ -38,9 +38,9 @@ class {{classname}}(
 
   lazy val route: Route =
   {{#operation}}
-    path({{#vendorExtensions.paths}}{{#isText}}"{{/isText}}{{value}}{{#isText}}"{{/isText}}{{#hasMore}} / {{/hasMore}}{{/vendorExtensions.paths}}) { {{^pathParams.isEmpty}}({{#pathParams}}{{paramName}}{{#hasMore}}, {{/hasMore}}{{/pathParams}}) => {{/pathParams.isEmpty}}
+    path({{#vendorExtensions.x-paths}}{{#isText}}"{{/isText}}{{value}}{{#isText}}"{{/isText}}{{#hasMore}} / {{/hasMore}}{{/vendorExtensions.x-paths}}) { {{^pathParams.isEmpty}}({{#pathParams}}{{paramName}}{{#hasMore}}, {{/hasMore}}{{/pathParams}}) => {{/pathParams.isEmpty}}
       {{#lambda.lowercase}}{{httpMethod}}{{/lambda.lowercase}} { {{^queryParams.isEmpty}}
-        parameters({{#queryParams}}"{{baseName}}".as[{{dataType}}]{{^required}}.?{{#vendorExtensions.hasDefaultValue}}({{{defaultValue}}}){{/vendorExtensions.hasDefaultValue}}{{/required}}{{#hasMore}}, {{/hasMore}}{{/queryParams}}) { ({{#queryParams}}{{paramName}}{{#hasMore}}, {{/hasMore}}{{/queryParams}}) =>{{/queryParams.isEmpty}} {{^headerParams.isEmpty}}
+        parameters({{#queryParams}}"{{baseName}}".as[{{dataType}}]{{^required}}.?{{#vendorExtensions.x-has-default-value}}({{{defaultValue}}}){{/vendorExtensions.x-has-default-value}}{{/required}}{{#hasMore}}, {{/hasMore}}{{/queryParams}}) { ({{#queryParams}}{{paramName}}{{#hasMore}}, {{/hasMore}}{{/queryParams}}) =>{{/queryParams.isEmpty}} {{^headerParams.isEmpty}}
           {{#headerParams}}{{#required}}headerValueByName{{/required}}{{^required}}optionalHeaderValueByName{{/required}}("{{baseName}}") { {{paramName}} => {{/headerParams}}{{/headerParams.isEmpty}}{{^cookieParams.isEmpty}}
             {{#cookieParams}}{{#required}}cookie({{/required}}{{^required}}optionalCookie({{/required}}"{{baseName}}"){ {{paramName}} => {{/cookieParams}}{{/cookieParams.isEmpty}}{{#isMultipart}}
 {{> multipart}}{{/isMultipart}}{{^isMultipart}}{{> noMultipart}}{{/isMultipart}}{{^cookieParams.isEmpty}}
@@ -63,15 +63,15 @@ object {{classname}}Patterns {
 trait {{classname}}Service {
 
 {{#operation}}
-{{#responses}}  def {{operationId}}{{#vendorExtensions.isDefault}}Default{{/vendorExtensions.isDefault}}{{^vendorExtensions.isDefault}}{{code}}{{/vendorExtensions.isDefault}}{{#baseType}}({{#vendorExtensions.isDefault}}statusCode: Int, {{/vendorExtensions.isDefault}}response{{baseType}}{{containerType}}: {{dataType}}){{^isPrimitiveType}}(implicit toEntityMarshaller{{baseType}}{{containerType}}: ToEntityMarshaller[{{dataType}}]){{/isPrimitiveType}}{{/baseType}}{{^baseType}}{{#vendorExtensions.isDefault}}(statusCode: Int){{/vendorExtensions.isDefault}}{{/baseType}}: Route =
-    complete(({{#vendorExtensions.isDefault}}statusCode{{/vendorExtensions.isDefault}}{{^vendorExtensions.isDefault}}{{code}}{{/vendorExtensions.isDefault}}, {{#baseType}}response{{baseType}}{{containerType}}{{/baseType}}{{^baseType}}"{{message}}"{{/baseType}}))
+{{#responses}}  def {{operationId}}{{#vendorExtensions.x-is-default}}Default{{/vendorExtensions.x-is-default}}{{^vendorExtensions.x-is-default}}{{code}}{{/vendorExtensions.x-is-default}}{{#baseType}}({{#vendorExtensions.x-is-default}}statusCode: Int, {{/vendorExtensions.x-is-default}}response{{baseType}}{{containerType}}: {{dataType}}){{^isPrimitiveType}}(implicit toEntityMarshaller{{baseType}}{{containerType}}: ToEntityMarshaller[{{dataType}}]){{/isPrimitiveType}}{{/baseType}}{{^baseType}}{{#vendorExtensions.x-is-default}}(statusCode: Int){{/vendorExtensions.x-is-default}}{{/baseType}}: Route =
+    complete(({{#vendorExtensions.x-is-default}}statusCode{{/vendorExtensions.x-is-default}}{{^vendorExtensions.x-is-default}}{{code}}{{/vendorExtensions.x-is-default}}, {{#baseType}}response{{baseType}}{{containerType}}{{/baseType}}{{^baseType}}"{{message}}"{{/baseType}}))
 {{/responses}}
   /**
 {{#responses}}   * {{#code}}Code: {{.}}{{/code}}{{#message}}, Message: {{.}}{{/message}}{{#dataType}}, DataType: {{.}}{{/dataType}}
    {{/responses}}
    */
-  def {{operationId}}({{> operationParam}}){{^vendorExtensions.specificMarshallers.isEmpty}}
-      (implicit {{#vendorExtensions.specificMarshallers}}toEntityMarshaller{{varName}}: ToEntityMarshaller[{{dataType}}]{{^-last}}, {{/-last}}{{/vendorExtensions.specificMarshallers}}){{/vendorExtensions.specificMarshallers.isEmpty}}: Route
+  def {{operationId}}({{> operationParam}}){{^vendorExtensions.x-specific-marshallers.isEmpty}}
+      (implicit {{#vendorExtensions.x-specific-marshallers}}toEntityMarshaller{{varName}}: ToEntityMarshaller[{{dataType}}]{{^-last}}, {{/-last}}{{/vendorExtensions.x-specific-marshallers}}){{/vendorExtensions.x-specific-marshallers.isEmpty}}: Route
 
 {{/operation}}
 }
diff --git a/modules/openapi-generator/src/main/resources/scala-akka-http-server/multipart.mustache b/modules/openapi-generator/src/main/resources/scala-akka-http-server/multipart.mustache
index 6f8d2355b2ed..e4c9c2a82333 100644
--- a/modules/openapi-generator/src/main/resources/scala-akka-http-server/multipart.mustache
+++ b/modules/openapi-generator/src/main/resources/scala-akka-http-server/multipart.mustache
@@ -1,12 +1,12 @@
-        formAndFiles({{#vendorExtensions.fileParams}}FileField("{{baseName}}")){{/vendorExtensions.fileParams}}{{#hasMore}}, {{/hasMore}} { partsAndFiles => {{^vendorExtensions.fileParams.isEmpty}}
+        formAndFiles({{#vendorExtensions.x-file-params}}FileField("{{baseName}}")){{/vendorExtensions.x-file-params}}{{#hasMore}}, {{/hasMore}} { partsAndFiles => {{^vendorExtensions.x-file-params.isEmpty}}
           val _____ : Try[Route] = for {
-            {{#vendorExtensions.fileParams}}{{baseName}} <- optToTry(partsAndFiles.files.get("{{baseName}}"), s"File {{baseName}} missing")
-            {{/vendorExtensions.fileParams}}
-          } yield { {{/vendorExtensions.fileParams.isEmpty}}
-            implicit val vp: StringValueProvider = partsAndFiles.form{{^vendorExtensions.nonFileParams.isEmpty}}
-            stringFields({{#vendorExtensions.nonFileParams}}"{{baseName}}".as[{{dataType}}]{{^required}}.?{{#vendorExtensions.hasDefaultValue}}({{defaultValue}}){{/vendorExtensions.hasDefaultValue}}{{/required}}{{#hasMore}}, {{/hasMore}}{{/vendorExtensions.nonFileParams}}) { ({{#vendorExtensions.nonFileParams}}{{paramName}}{{#hasMore}}, {{/hasMore}}{{/vendorExtensions.nonFileParams}}) =>{{/vendorExtensions.nonFileParams.isEmpty}}
+            {{#vendorExtensions.x-file-params}}{{baseName}} <- optToTry(partsAndFiles.files.get("{{baseName}}"), s"File {{baseName}} missing")
+            {{/vendorExtensions.x-file-params}}
+          } yield { {{/vendorExtensions.x-file-params.isEmpty}}
+            implicit val vp: StringValueProvider = partsAndFiles.form{{^vendorExtensions.x-non-file-params.isEmpty}}
+            stringFields({{#vendorExtensions.x-non-file-params}}"{{baseName}}".as[{{dataType}}]{{^required}}.?{{#vendorExtensions.x-has-default-value}}({{defaultValue}}){{/vendorExtensions.x-has-default-value}}{{/required}}{{#hasMore}}, {{/hasMore}}{{/vendorExtensions.x-non-file-params}}) { ({{#vendorExtensions.x-non-file-params}}{{paramName}}{{#hasMore}}, {{/hasMore}}{{/vendorExtensions.x-non-file-params}}) =>{{/vendorExtensions.x-non-file-params.isEmpty}}
               {{classVarName}}Service.{{operationId}}({{#allParams}}{{paramName}} = {{paramName}}{{#hasMore}}, {{/hasMore}}{{/allParams}}){{^vendorExtensions.nonFileFormParams.isEmpty}}
-            }{{/vendorExtensions.nonFileFormParams.isEmpty}}{{^vendorExtensions.fileParams.isEmpty}}
+            }{{/vendorExtensions.nonFileFormParams.isEmpty}}{{^vendorExtensions.x-file-params.isEmpty}}
           }
-          _____.fold[Route](t => reject(MalformedRequestContentRejection("Missing file.", t)), identity){{/vendorExtensions.fileParams.isEmpty}}
+          _____.fold[Route](t => reject(MalformedRequestContentRejection("Missing file.", t)), identity){{/vendorExtensions.x-file-params.isEmpty}}
         }
\ No newline at end of file
diff --git a/modules/openapi-generator/src/main/resources/scala-akka-http-server/noMultipart.mustache b/modules/openapi-generator/src/main/resources/scala-akka-http-server/noMultipart.mustache
index a4c25bb27d2d..8a32c3333f65 100644
--- a/modules/openapi-generator/src/main/resources/scala-akka-http-server/noMultipart.mustache
+++ b/modules/openapi-generator/src/main/resources/scala-akka-http-server/noMultipart.mustache
@@ -1,6 +1,6 @@
 {{^formParams.isEmpty}}
 
-          formFields({{#formParams}}"{{baseName}}".as[{{#isPrimitiveType}}{{dataType}}{{/isPrimitiveType}}{{^isPrimitiveType}}String{{/isPrimitiveType}}]{{^required}}.?{{#vendorExtensions.hasDefaultValue}}({{defaultValue}}){{/vendorExtensions.hasDefaultValue}}{{/required}}{{#hasMore}}, {{/hasMore}}{{/formParams}}) { ({{#formParams}}{{paramName}}{{#hasMore}}, {{/hasMore}}{{/formParams}}) =>{{/formParams.isEmpty}}
+          formFields({{#formParams}}"{{baseName}}".as[{{#isPrimitiveType}}{{dataType}}{{/isPrimitiveType}}{{^isPrimitiveType}}String{{/isPrimitiveType}}]{{^required}}.?{{#vendorExtensions.x-has-default-value}}({{defaultValue}}){{/vendorExtensions.x-has-default-value}}{{/required}}{{#hasMore}}, {{/hasMore}}{{/formParams}}) { ({{#formParams}}{{paramName}}{{#hasMore}}, {{/hasMore}}{{/formParams}}) =>{{/formParams.isEmpty}}
             {{#bodyParam}}{{^isPrimitiveType}}entity(as[{{dataType}}]){ {{paramName}} =>
               {{/isPrimitiveType}}{{/bodyParam}}{{classVarName}}Service.{{operationId}}({{#allParams}}{{paramName}} = {{paramName}}{{#hasMore}}, {{/hasMore}}{{/allParams}}){{#bodyParam}}{{^isPrimitiveType}}
             }{{/isPrimitiveType}}{{/bodyParam}}{{^formParams.isEmpty}}
diff --git a/modules/openapi-generator/src/main/resources/scala-akka-http-server/operationParam.mustache b/modules/openapi-generator/src/main/resources/scala-akka-http-server/operationParam.mustache
index 7e5846f3b882..c41442894066 100644
--- a/modules/openapi-generator/src/main/resources/scala-akka-http-server/operationParam.mustache
+++ b/modules/openapi-generator/src/main/resources/scala-akka-http-server/operationParam.mustache
@@ -1 +1 @@
-{{#allParams}}{{paramName}}: {{#isFile}}(FileInfo, File){{/isFile}}{{^isFile}}{{^required}}{{^vendorExtensions.hasDefaultValue}}Option[{{/vendorExtensions.hasDefaultValue}}{{/required}}{{dataType}}{{^required}}{{^vendorExtensions.hasDefaultValue}}]{{/vendorExtensions.hasDefaultValue}}{{/required}}{{/isFile}}{{#hasMore}}, {{/hasMore}}{{/allParams}}
\ No newline at end of file
+{{#allParams}}{{paramName}}: {{#isFile}}(FileInfo, File){{/isFile}}{{^isFile}}{{^required}}{{^vendorExtensions.x-has-default-value}}Option[{{/vendorExtensions.x-has-default-value}}{{/required}}{{dataType}}{{^required}}{{^vendorExtensions.x-has-default-value}}]{{/vendorExtensions.x-has-default-value}}{{/required}}{{/isFile}}{{#hasMore}}, {{/hasMore}}{{/allParams}}
\ No newline at end of file