diff --git a/clang/include/clang/AST/ASTVector.h b/clang/include/clang/AST/ASTVector.h
index 13ac375022db..56f4d17cb490 100644
--- a/clang/include/clang/AST/ASTVector.h
+++ b/clang/include/clang/AST/ASTVector.h
@@ -18,7 +18,7 @@
 #ifndef LLVM_CLANG_AST_VECTOR
 #define LLVM_CLANG_AST_VECTOR
 
-#include "clang/AST/ASTContext.h"
+#include "clang/AST/AttrIterator.h"
 #include "llvm/Support/type_traits.h"
 #include "llvm/Support/Allocator.h"
 #include "llvm/ADT/PointerIntPair.h"
@@ -51,6 +51,7 @@ namespace std {
 #endif
 
 namespace clang {
+  class ASTContext;
 
 template<typename T>
 class ASTVector {