diff --git a/include/llvm/PassManager.h b/include/llvm/PassManager.h
index 367809e5cce..64499ca8bd5 100644
--- a/include/llvm/PassManager.h
+++ b/include/llvm/PassManager.h
@@ -60,7 +60,7 @@ public:
   /// track of whether any of the passes modifies the function, and if
   /// so, return true.
   ///
-  bool run(Function &M);
+  bool run(Function &F);
 };
 
 #endif