diff --git a/packages/quicktype-core/src/language/TypeScriptFlow.ts b/packages/quicktype-core/src/language/TypeScriptFlow.ts
index 3bc02e2a9..0c5750006 100644
--- a/packages/quicktype-core/src/language/TypeScriptFlow.ts
+++ b/packages/quicktype-core/src/language/TypeScriptFlow.ts
@@ -51,7 +51,8 @@ export abstract class TypeScriptFlowBaseTargetLanguage extends JavaScriptTargetL
             tsFlowOptions.converters,
             tsFlowOptions.rawType,
             tsFlowOptions.preferUnions,
-            tsFlowOptions.preferTypes
+            tsFlowOptions.preferTypes,
+            tsFlowOptions.preferConstValues
         ];
     }