diff --git a/microscript/ILibDuktape_ReadableStream.c b/microscript/ILibDuktape_ReadableStream.c
index 6b1ed8d..feccf12 100644
--- a/microscript/ILibDuktape_ReadableStream.c
+++ b/microscript/ILibDuktape_ReadableStream.c
@@ -935,7 +935,7 @@ ILibDuktape_readableStream* ILibDuktape_ReadableStream_InitEx(duk_context *ctx,
 	retVal->ResumeHandler = OnResume;
 	retVal->UnshiftHandler = OnUnshift;
 	sem_init(&(retVal->pipeLock), 0, 1);
-	ILibDuktape_CreateFinalizer(ctx, ILibDuktape_ReadableStream_PipeLockFinalizer);
+	ILibDuktape_CreateFinalizerEx(ctx, ILibDuktape_ReadableStream_PipeLockFinalizer, 1);
 
 	retVal->emitter = emitter = ILibDuktape_EventEmitter_Create(ctx);
 	ILibDuktape_EventEmitter_CreateEventEx(emitter, "end");