1 files changed, 4 insertions, 2 deletions
diff --git a/clang/include/clang/AST/Builtins.h b/clang/include/clang/AST/Builtins.h
index 007e8dea8d1..e4cce371da6 100644
--- a/clang/include/clang/AST/Builtins.h
+++ b/clang/include/clang/AST/Builtins.h
@@ -16,8 +16,10 @@
 #define LLVM_CLANG_AST_BUILTINS_H
 
 #include <cstring>
-#include <string>
-#include "llvm/ADT/SmallVector.h"
+
+namespace llvm {
+  template <typename T> class SmallVectorImpl;
+}
 
 namespace clang {
   class TargetInfo;