diff --git a/llvm/include/llvm/Transforms/Utils/Evaluator.h b/llvm/include/llvm/Transforms/Utils/Evaluator.h
index 9968cfb47cef..9346212dd888 100644
--- a/llvm/include/llvm/Transforms/Utils/Evaluator.h
+++ b/llvm/include/llvm/Transforms/Utils/Evaluator.h
@@ -36,7 +36,7 @@ class TargetLibraryInfo;
 /// be iterated over after the evaluation is complete.  Once an evaluation call
 /// fails, the evaluation object should not be reused.
 class Evaluator {
-  class MutableAggregate;
+  struct MutableAggregate;
 
   /// The evaluator represents values either as a Constant*, or as a
   /// MutableAggregate, which allows changing individual aggregate elements