diff --git a/llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp b/llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp
--- a/llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp
+++ b/llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp
@@ -1307,7 +1307,7 @@
       return "u32";
   }
   llvm_unreachable("unexpected type");
-  return nullptr;
+  return {};
 }

 void NVPTXAsmPrinter::emitPTXGlobalVariable(const GlobalVariable *GVar,