diff --git a/lib/tlists.h b/lib/tlists.h
index 96172ad6..a652ba50 100644
--- a/lib/tlists.h
+++ b/lib/tlists.h
@@ -193,6 +193,7 @@ static inline void TLIST_NAME(rem_node)(TLIST_LIST_STRUCT *list, TLIST_TYPE *nod
 #undef TLIST_WANT_ADD_HEAD
 #undef TLIST_WANT_ADD_TAIL
 #undef TLIST_WANT_UPDATE_NODE
+#undef TLIST_DEFINED_BEFORE
 
 # endif
 #else