diff --git a/SPIRV/SPVRemapper.cpp b/SPIRV/SPVRemapper.cpp
index 3fa233cb..ff5bb647 100755
--- a/SPIRV/SPVRemapper.cpp
+++ b/SPIRV/SPVRemapper.cpp
@@ -497,6 +497,7 @@ namespace spv {
                 break;
 
             default:
+                assert(0 && "Unhandled Operand Class");
                 break;
             }
         }