diff --git a/lib/Basic/Targets.cpp b/lib/Basic/Targets.cpp
index 4faeac6..0552544 100644
--- a/lib/Basic/Targets.cpp
+++ b/lib/Basic/Targets.cpp
@@ -1579,6 +1579,7 @@
     SizeType = UnsignedLongLong;
     PtrDiffType = SignedLongLong;
     IntPtrType = SignedLongLong;
+    this->UserLabelPrefix = "";
   }
   virtual void getTargetDefines(const LangOptions &Opts,
                                 MacroBuilder &Builder) const {