diff --git a/init/init.cpp b/init/init.cpp
index 19a67dd18..c1e9c01e4 100644
--- a/init/init.cpp
+++ b/init/init.cpp
@@ -369,7 +369,7 @@ void service_start(struct service *svc, const char *dynamic_args)
     svc->flags |= SVC_RUNNING;
 
     if ((svc->flags & SVC_EXEC) != 0) {
-        INFO("SVC_EXEC pid %d (uid %d gid %d+%d context %s) started; waiting...\n",
+        INFO("SVC_EXEC pid %d (uid %d gid %d+%zu context %s) started; waiting...\n",
              svc->pid, svc->uid, svc->gid, svc->nr_supp_gids, svc->seclabel);
         waiting_for_exec = true;
     }