diff --git a/llvm/include/llvm/Analysis/DXILResource.h b/llvm/include/llvm/Analysis/DXILResource.h
index cfeed5c4ef76f..08af19970b662 100644
--- a/llvm/include/llvm/Analysis/DXILResource.h
+++ b/llvm/include/llvm/Analysis/DXILResource.h
@@ -671,6 +671,8 @@ class DXILResourceBindingInfo {
     case dxil::ResourceClass::Sampler:
       return SamplerSpaces;
     }
+
+    llvm_unreachable("Invalid resource class");
   }
 
   friend class DXILResourceBindingAnalysis;