diff --git a/src/expand.c b/src/expand.c
index b7795d6a..481e290e 100644
--- a/src/expand.c
+++ b/src/expand.c
@@ -146,6 +146,8 @@ expand(pic_state *pic, pic_value obj, struct syntactic_env *env)
     pic_error(pic, "unexpected value type");
     return pic_undef_value();	/* unreachable */
   }
+  /* logic falw (suppress warnings gcc will emit) */
+  abort();
 }
 
 pic_value