diff --git a/src/option_parser.cpp b/src/option_parser.cpp
index 5d0cd80b..4d4a0d1e 100644
--- a/src/option_parser.cpp
+++ b/src/option_parser.cpp
@@ -135,7 +135,7 @@ _parse_and_process_kv_arg(const std::string &key_,
   if(rv < 0)
     cfg.errs.push_back({-rv,key+'='+val});
 
-  return 0;
+  return OPT_DISCARD;
 }
 
 static