diff --git a/llvm/unittests/ADT/MappedIteratorTest.cpp b/llvm/unittests/ADT/MappedIteratorTest.cpp
index ca54cb30f956..f2858bd11ece 100644
--- a/llvm/unittests/ADT/MappedIteratorTest.cpp
+++ b/llvm/unittests/ADT/MappedIteratorTest.cpp
@@ -34,7 +34,7 @@ struct Plus1FunctionRef {
 
   using FuncT = int (&)(int);
 
-  FuncT operator()() const { return *plus1; }
+  FuncT operator()() const { return (FuncT)*plus1; }
 };
 
 struct Plus1FunctionPtr {