diff --git a/utils/TableGen/NeonEmitter.cpp b/utils/TableGen/NeonEmitter.cpp
index 3516d318855..a754ce289a9 100644
--- a/utils/TableGen/NeonEmitter.cpp
+++ b/utils/TableGen/NeonEmitter.cpp
@@ -1016,6 +1016,8 @@ static unsigned RangeFromType(StringRef typestr) {
       throw "unhandled type!";
       break;
   }
+  assert(0 && "unreachable");
+  return 0;
 }
 
 /// runHeader - Emit a file with sections defining: