diff --git a/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp b/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp
--- a/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp
+++ b/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp
@@ -3352,7 +3352,7 @@
     llvm::Type *VarTy = CGF.ConvertTypeForMem(VD->getType());
     auto *GV = new llvm::GlobalVariable(
         CGM.getModule(), VarTy, /*isConstant=*/false,
-        llvm::GlobalValue::InternalLinkage, llvm::Constant::getNullValue(VarTy),
+        llvm::GlobalValue::InternalLinkage, llvm::UndefValue::get(VarTy),
         VD->getName(),
         /*InsertBefore=*/nullptr, llvm::GlobalValue::NotThreadLocal,
         CGM.getContext().getTargetAddressSpace(AS));