diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/ElmClientCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/ElmClientCodegen.java
index b92d62445bc..05642204b1e 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/ElmClientCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/ElmClientCodegen.java
@@ -694,7 +694,10 @@ public class ElmClientCodegen extends DefaultCodegen implements CodegenConfig {
         }
         final String prefix = toEnumName(property);
         for (Map<String, Object> enumVar : enumVars) {
-            enumVar.put("name", prefix + enumVar.get("name"));
+            if (!enumVar.containsKey("_isPrefixed")) {
+                enumVar.put("name", prefix + enumVar.get("name"));
+                enumVar.put("_isPrefixed", true);
+            }
         }
     }