diff --git a/xfa/fxfa/fm2js/xfa_fm2jscontext.cpp b/xfa/fxfa/fm2js/xfa_fm2jscontext.cpp
index b5ba3f7..8a7849f 100644
--- a/xfa/fxfa/fm2js/xfa_fm2jscontext.cpp
+++ b/xfa/fxfa/fm2js/xfa_fm2jscontext.cpp
@@ -4653,7 +4653,7 @@
   FX_GUID_CreateV4(&guid);
 
   CFX_ByteString bsUId;
-  FX_GUID_ToString(&guid, bsUId, iNum);
+  FX_GUID_ToString(&guid, bsUId, !!iNum);
   args.GetReturnValue()->SetString(bsUId.AsStringC());
 }