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 e669b229788..ea4583aec17 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
@@ -264,16 +264,17 @@ public class ScalaAkkaHttpServerCodegen extends AbstractScalaCodegen implements
     @Override
     public CodegenParameter fromParameter(Parameter parameter, Set<String> imports) {
         CodegenParameter param = super.fromParameter(parameter, imports);
-        // Removing unhandled types
-        if (!primitiveParamTypes.contains(param.dataType)) {
-            param.dataType = "String";
-        }
-        if (!param.required) {
-            param.vendorExtensions.put("x-has-default-value", param.defaultValue != null);
-            // Escaping default string values
-            if (param.defaultValue != null && "String".equals(param.dataType)) {
-                param.defaultValue = String.format(Locale.ROOT, "\"%s\"", param.defaultValue);
+        if (primitiveParamTypes.contains(param.dataType)) {
+            if (!param.required) {
+                param.vendorExtensions.put("x-has-default-value", param.defaultValue != null);
+                // Escaping default string values
+                if (param.defaultValue != null && "String".equals(param.dataType)) {
+                    param.defaultValue = String.format(Locale.ROOT, "\"%s\"", param.defaultValue);
+                }
             }
+        } else {
+            // Removing unhandled types
+            param.dataType = "String";
         }
         return param;
     }
diff --git a/samples/server/petstore/scala-akka-http-server/.openapi-generator/VERSION b/samples/server/petstore/scala-akka-http-server/.openapi-generator/VERSION
index d509cc92aa8..4b448de535c 100644
--- a/samples/server/petstore/scala-akka-http-server/.openapi-generator/VERSION
+++ b/samples/server/petstore/scala-akka-http-server/.openapi-generator/VERSION
@@ -1 +1 @@
-5.1.1-SNAPSHOT
\ No newline at end of file
+5.3.0-SNAPSHOT
\ No newline at end of file