diff --git a/llvm/include/llvm/IR/GlobalAlias.h b/llvm/include/llvm/IR/GlobalAlias.h
--- a/llvm/include/llvm/IR/GlobalAlias.h
+++ b/llvm/include/llvm/IR/GlobalAlias.h
@@ -60,6 +60,7 @@
 
   void copyAttributesFrom(const GlobalValue *Src) {
     GlobalValue::copyAttributesFrom(Src);
+    setThreadLocalMode(Src->getThreadLocalMode());
   }
 
   /// removeFromParent - This method unlinks 'this' from the containing module,