diff --git a/clang/lib/CodeGen/CGExprConstant.cpp b/clang/lib/CodeGen/CGExprConstant.cpp
index 52d61f1e29808..2c847f0bb13fd 100644
--- a/clang/lib/CodeGen/CGExprConstant.cpp
+++ b/clang/lib/CodeGen/CGExprConstant.cpp
@@ -1132,7 +1132,7 @@ class ConstExprEmitter :
         return CGM.GetAddrOfConstantStringFromLiteral(S).getPointer();
       return nullptr;
     case CK_NullToPointer:
-      if (llvm::Constant *C = Visit(subExpr, destType))
+      if (Visit(subExpr, destType))
         return CGM.EmitNullConstant(destType);
       return nullptr;