diff --git a/modules/openapi-generator/src/main/resources/typescript-fetch/apis.mustache b/modules/openapi-generator/src/main/resources/typescript-fetch/apis.mustache
index 32f0a1c54bb5..41740e24c23b 100644
--- a/modules/openapi-generator/src/main/resources/typescript-fetch/apis.mustache
+++ b/modules/openapi-generator/src/main/resources/typescript-fetch/apis.mustache
@@ -122,12 +122,7 @@ export class {{classname}} extends runtime.BaseAPI {
             queryParameters['{{baseName}}'] = (requestParameters.{{paramName}} as any).toISOString().substr(0,10);
             {{/isDate}}
             {{^isDate}}
-            {{#vendorExtensions.x-codegen-isDeepObject}}
-            queryParameters['{{baseName}}'] = runtime.querystring(requestParameters.{{paramName}} as unknown as runtime.HTTPQuery, '{{baseName}}');
-            {{/vendorExtensions.x-codegen-isDeepObject}}
-            {{^vendorExtensions.x-codegen-isDeepObject}}
             queryParameters['{{baseName}}'] = requestParameters.{{paramName}};
-            {{/vendorExtensions.x-codegen-isDeepObject}}
             {{/isDate}}
             {{/isDateTime}}
         }