1 files changed, 2 insertions, 0 deletions
diff --git a/include/clang/AST/Mangle.h b/include/clang/AST/Mangle.h
index 5a42aec0dc..7c7495ee67 100644
--- a/include/clang/AST/Mangle.h
+++ b/include/clang/AST/Mangle.h
@@ -27,6 +27,8 @@ namespace clang {
   class CXXConstructorDecl;
   class CXXDestructorDecl;
   class CXXMethodDecl;
+  class DeclContext;
+  class DiagnosticsEngine;
   class FunctionDecl;
   class NamedDecl;
   class ObjCMethodDecl;