diff --git a/llvm/lib/CodeGen/StackProtector.cpp b/llvm/lib/CodeGen/StackProtector.cpp
index e478f31..91cc7b7 100644
--- a/llvm/lib/CodeGen/StackProtector.cpp
+++ b/llvm/lib/CodeGen/StackProtector.cpp
@@ -480,12 +480,12 @@
   if (Trip.getOS() == llvm::Triple::OpenBSD) {
     Constant *StackChkFail = M->getOrInsertFunction(
         "__stack_smash_handler", Type::getVoidTy(Context),
-        Type::getInt8PtrTy(Context), NULL);
+        Type::getInt8PtrTy(Context), nullptr);
 
     B.CreateCall(StackChkFail, B.CreateGlobalStringPtr(F->getName(), "SSH"));
   } else {
     Constant *StackChkFail = M->getOrInsertFunction(
-        "__stack_chk_fail", Type::getVoidTy(Context), NULL);
+        "__stack_chk_fail", Type::getVoidTy(Context), nullptr);
     B.CreateCall(StackChkFail);
   }
   B.CreateUnreachable();