diff --git a/clang/include/clang/AST/DeclFriend.h b/clang/include/clang/AST/DeclFriend.h
index 48ccb7c2adda..172c46a44ac1 100644
--- a/clang/include/clang/AST/DeclFriend.h
+++ b/clang/include/clang/AST/DeclFriend.h
@@ -82,6 +82,7 @@ private:
 
   FriendDecl(EmptyShell Empty, unsigned NumFriendTypeTPLists)
     : Decl(Decl::Friend, Empty), NextFriend(),
+      UnsupportedFriend(false),
       NumTPLists(NumFriendTypeTPLists) { }
 
   FriendDecl *getNextFriend() {