diff --git a/lib/roken/getarg.c b/lib/roken/getarg.c
index 8fbdcf680..60b0f645a 100644
--- a/lib/roken/getarg.c
+++ b/lib/roken/getarg.c
@@ -475,6 +475,9 @@ arg_match_long(struct getargs *args, size_t num_args,
     default:
 	abort ();
     }
+
+    /* not reached */
+    return ARG_ERR_NO_MATCH;
 }
 
 static int