diff --git a/llvm/include/llvm/Frontend/OpenMP/OMPGridValues.h b/llvm/include/llvm/Frontend/OpenMP/OMPGridValues.h
--- a/llvm/include/llvm/Frontend/OpenMP/OMPGridValues.h
+++ b/llvm/include/llvm/Frontend/OpenMP/OMPGridValues.h
@@ -100,7 +100,7 @@
 };
 
 template <unsigned wavesize> constexpr const GV &getAMDGPUGridValues() {
-  static_assert(wavesize == 32 || wavesize == 64);
+  static_assert(wavesize == 32 || wavesize == 64, "Unexpected wavesize");
   return wavesize == 32 ? AMDGPUGridValues32 : AMDGPUGridValues64;
 }