diff --git a/include/clang/AST/APValue.h b/include/clang/AST/APValue.h
index 8fbb04e975..d88757de1a 100644
--- a/include/clang/AST/APValue.h
+++ b/include/clang/AST/APValue.h
@@ -54,6 +54,7 @@ private:
   struct Vec {
     APValue *Elts;
     unsigned NumElts;
+    Vec() : Elts(0), NumElts(0) {}
     ~Vec() { delete[] Elts; }
   };