diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/JavaClientCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/JavaClientCodegen.java
index 27561d94fa1..9e66bcf6ad2 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/JavaClientCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/JavaClientCodegen.java
@@ -133,7 +133,7 @@ public class JavaClientCodegen extends AbstractJavaCodegen
     protected String serializationLibrary = null;
     protected boolean useOneOfDiscriminatorLookup = false; // use oneOf discriminator's mapping for model lookup
     protected String rootJavaEEPackage;
-    protected Map<String, MpRestClientVersion> mpRestClientVersions = new HashMap<>();
+    protected Map<String, MpRestClientVersion> mpRestClientVersions = new LinkedHashMap<>();
     protected boolean useSingleRequestParameter = false;
     protected boolean webclientBlockingOperations = false;
     protected boolean generateClientAsBean = false;