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 f91cf183d72c..8d0daf61cabd 100644
--- a/modules/openapi-generator/src/main/resources/typescript-fetch/apis.mustache
+++ b/modules/openapi-generator/src/main/resources/typescript-fetch/apis.mustache
@@ -161,7 +161,7 @@ export class {{classname}} extends runtime.BaseAPI {
             })
             {{/isCollectionFormatMulti}}
             {{^isCollectionFormatMulti}}
-            formData.append('{{baseName}}', requestParameters.{{paramName}}.join(COLLECTION_FORMATS["{{collectionFormat}}"]));
+            formData.append('{{baseName}}', requestParameters.{{paramName}}.join(runtime.COLLECTION_FORMATS["{{collectionFormat}}"]));
             {{/isCollectionFormatMulti}}
         }