diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/TypeScriptFetchClientCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/TypeScriptFetchClientCodegen.java
index dd5f4f503d63..af313325c949 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/TypeScriptFetchClientCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/TypeScriptFetchClientCodegen.java
@@ -283,6 +283,7 @@ public void processOpts() {
 
         if (additionalProperties.containsKey(STRING_ENUMS)) {
             this.setStringEnums(convertPropertyToBoolean(STRING_ENUMS));
+            additionalProperties.put("stringEnums", this.stringEnums);
         }
 
         if (additionalProperties.containsKey(FILE_NAMING)) {