diff --git a/src/make_enum.hpp b/src/make_enum.hpp
index 63b16738912..9ec1b3cf157 100644
--- a/src/make_enum.hpp
+++ b/src/make_enum.hpp
@@ -179,6 +179,7 @@ PREFIX std::string CAT2(NAME,_to_string) (NAME val) \
 { \
         BOOST_PP_SEQ_FOR_EACH(EXPANDENUMFUNCTIONREV,  , MAKEPAIRS(CONTENT)) \
         assert(false && "Corrupted enum found with identifier NAME"); \
+        throw 42; \
 }