1 files changed, 2 insertions, 1 deletions
diff --git a/include/clang/AST/ASTContext.h b/include/clang/AST/ASTContext.h
index c0eeb5af38..2f2cc9a3e1 100644
--- a/include/clang/AST/ASTContext.h
+++ b/include/clang/AST/ASTContext.h
@@ -96,7 +96,8 @@ class ASTContext {
     DependentSizedExtVectorTypes;
   mutable llvm::FoldingSet<VectorType> VectorTypes;
   mutable llvm::FoldingSet<FunctionNoProtoType> FunctionNoProtoTypes;
-  mutable llvm::FoldingSet<FunctionProtoType> FunctionProtoTypes;
+  mutable llvm::ContextualFoldingSet<FunctionProtoType, ASTContext&>
+    FunctionProtoTypes;
   mutable llvm::FoldingSet<DependentTypeOfExprType> DependentTypeOfExprTypes;
   mutable llvm::FoldingSet<DependentDecltypeType> DependentDecltypeTypes;
   mutable llvm::FoldingSet<TemplateTypeParmType> TemplateTypeParmTypes;