diff --git a/src/option_parser.cpp b/src/option_parser.cpp
index d703d21a..29f57e8d 100644
--- a/src/option_parser.cpp
+++ b/src/option_parser.cpp
@@ -179,7 +179,7 @@ _process_mount(const char *arg_)
   if(rv < 0)
     cfg.errs.push_back({-rv,"mount="+arg});
 
-  return 0;
+  return OPT_DISCARD;
 }
 
 static