diff --git a/include/llvm/IR/Instructions.h b/include/llvm/IR/Instructions.h
index 75696f7ab09..57b0d89276e 100644
--- a/include/llvm/IR/Instructions.h
+++ b/include/llvm/IR/Instructions.h
@@ -2658,7 +2658,7 @@ public:
   protected:
 
     SwitchInstTy *SI;
-    unsigned long Index;
+    unsigned Index;
     SubsetsItTy SubsetIt;
 
     /// Initializes case iterator for given SwitchInst and for given