diff --git a/modules/openapi-generator/src/main/resources/scala-akka-client/model.mustache b/modules/openapi-generator/src/main/resources/scala-akka-client/model.mustache
index d234919c33e2..f4c9eb919fe2 100644
--- a/modules/openapi-generator/src/main/resources/scala-akka-client/model.mustache
+++ b/modules/openapi-generator/src/main/resources/scala-akka-client/model.mustache
@@ -12,7 +12,7 @@ case class {{classname}} (
   {{#description}}
   /* {{{description}}} */
   {{/description}}
-  {{{name}}}: {{^required}}Option[{{/required}}{{^isEnum}}{{dataType}}{{/isEnum}}{{#isEnum}}{{classname}}Enums.{{datatypeWithEnum}}{{/isEnum}}{{^required}}]{{/required}}{{#hasMore}},{{/hasMore}}
+  {{{name}}}: {{^required}}Option[{{/required}}{{^isEnum}}{{dataType}}{{/isEnum}}{{#isEnum}}{{classname}}Enums.{{datatypeWithEnum}}{{/isEnum}}{{^required}}] = None{{/required}}{{#hasMore}},{{/hasMore}}
   {{/vars}}
 ) extends ApiModel
 
diff --git a/samples/client/petstore/scala-akka/src/main/scala/org/openapitools/client/model/ApiResponse.scala b/samples/client/petstore/scala-akka/src/main/scala/org/openapitools/client/model/ApiResponse.scala
index 9cf9701a0b7c..c2ac538c9ab8 100644
--- a/samples/client/petstore/scala-akka/src/main/scala/org/openapitools/client/model/ApiResponse.scala
+++ b/samples/client/petstore/scala-akka/src/main/scala/org/openapitools/client/model/ApiResponse.scala
@@ -16,7 +16,7 @@ import org.joda.time.DateTime
 import java.util.UUID
 
 case class ApiResponse(
-    code: Option[Int],
-    `type`: Option[String],
-    message: Option[String]
+    code: Option[Int] = None,
+    `type`: Option[String] = None,
+    message: Option[String] = None
 ) extends ApiModel
diff --git a/samples/client/petstore/scala-akka/src/main/scala/org/openapitools/client/model/Category.scala b/samples/client/petstore/scala-akka/src/main/scala/org/openapitools/client/model/Category.scala
index 53b1eb8fa8c3..46d4b4a8bed9 100644
--- a/samples/client/petstore/scala-akka/src/main/scala/org/openapitools/client/model/Category.scala
+++ b/samples/client/petstore/scala-akka/src/main/scala/org/openapitools/client/model/Category.scala
@@ -16,6 +16,6 @@ import org.joda.time.DateTime
 import java.util.UUID
 
 case class Category(
-    id: Option[Long],
-    name: Option[String]
+    id: Option[Long] = None,
+    name: Option[String] = None
 ) extends ApiModel
diff --git a/samples/client/petstore/scala-akka/src/main/scala/org/openapitools/client/model/Order.scala b/samples/client/petstore/scala-akka/src/main/scala/org/openapitools/client/model/Order.scala
index d36343361282..964f6f5d9cfa 100644
--- a/samples/client/petstore/scala-akka/src/main/scala/org/openapitools/client/model/Order.scala
+++ b/samples/client/petstore/scala-akka/src/main/scala/org/openapitools/client/model/Order.scala
@@ -16,13 +16,13 @@ import org.joda.time.DateTime
 import java.util.UUID
 
 case class Order(
-    id: Option[Long],
-    petId: Option[Long],
-    quantity: Option[Int],
-    shipDate: Option[DateTime],
+    id: Option[Long] = None,
+    petId: Option[Long] = None,
+    quantity: Option[Int] = None,
+    shipDate: Option[DateTime] = None,
     /* Order Status */
-    status: Option[OrderEnums.Status],
-    complete: Option[Boolean]
+    status: Option[OrderEnums.Status] = None,
+    complete: Option[Boolean] = None
 ) extends ApiModel
 
 object OrderEnums {
diff --git a/samples/client/petstore/scala-akka/src/main/scala/org/openapitools/client/model/Pet.scala b/samples/client/petstore/scala-akka/src/main/scala/org/openapitools/client/model/Pet.scala
index 3adfab853f32..e2d48ce53622 100644
--- a/samples/client/petstore/scala-akka/src/main/scala/org/openapitools/client/model/Pet.scala
+++ b/samples/client/petstore/scala-akka/src/main/scala/org/openapitools/client/model/Pet.scala
@@ -16,13 +16,13 @@ import org.joda.time.DateTime
 import java.util.UUID
 
 case class Pet(
-    id: Option[Long],
-    category: Option[Category],
+    id: Option[Long] = None,
+    category: Option[Category] = None,
     name: String,
     photoUrls: Seq[String],
-    tags: Option[Seq[Tag]],
+    tags: Option[Seq[Tag]] = None,
     /* pet status in the store */
-    status: Option[PetEnums.Status]
+    status: Option[PetEnums.Status] = None
 ) extends ApiModel
 
 object PetEnums {
diff --git a/samples/client/petstore/scala-akka/src/main/scala/org/openapitools/client/model/Tag.scala b/samples/client/petstore/scala-akka/src/main/scala/org/openapitools/client/model/Tag.scala
index ab1546b7dc6e..221bce43031f 100644
--- a/samples/client/petstore/scala-akka/src/main/scala/org/openapitools/client/model/Tag.scala
+++ b/samples/client/petstore/scala-akka/src/main/scala/org/openapitools/client/model/Tag.scala
@@ -16,6 +16,6 @@ import org.joda.time.DateTime
 import java.util.UUID
 
 case class Tag(
-    id: Option[Long],
-    name: Option[String]
+    id: Option[Long] = None,
+    name: Option[String] = None
 ) extends ApiModel
diff --git a/samples/client/petstore/scala-akka/src/main/scala/org/openapitools/client/model/User.scala b/samples/client/petstore/scala-akka/src/main/scala/org/openapitools/client/model/User.scala
index ebfd3a90491b..a386047bfda1 100644
--- a/samples/client/petstore/scala-akka/src/main/scala/org/openapitools/client/model/User.scala
+++ b/samples/client/petstore/scala-akka/src/main/scala/org/openapitools/client/model/User.scala
@@ -16,13 +16,13 @@ import org.joda.time.DateTime
 import java.util.UUID
 
 case class User(
-    id: Option[Long],
-    username: Option[String],
-    firstName: Option[String],
-    lastName: Option[String],
-    email: Option[String],
-    password: Option[String],
-    phone: Option[String],
+    id: Option[Long] = None,
+    username: Option[String] = None,
+    firstName: Option[String] = None,
+    lastName: Option[String] = None,
+    email: Option[String] = None,
+    password: Option[String] = None,
+    phone: Option[String] = None,
     /* User Status */
-    userStatus: Option[Int]
+    userStatus: Option[Int] = None
 ) extends ApiModel