diff --git a/sched/feeder.cpp b/sched/feeder.cpp
index e1c420a6c2..0a638ee0a5 100644
--- a/sched/feeder.cpp
+++ b/sched/feeder.cpp
@@ -774,7 +774,7 @@ int main(int argc, char** argv) {
                 exit(1);
             }
             strcat(mod_select_clause, " and workunit.appid in (");
-            strncat(mod_select_clause, argv[i], sizeof(mod_select_clause)-25);
+            safe_strcat(mod_select_clause, argv[i]);
             strcat(mod_select_clause, ")");
         } else if (is_arg(argv[i], "mod")) {
             if (!argv[i+1] || !argv[i+2]) {