diff --git a/src/libeis-socket.c b/src/libeis-socket.c
index 25199fb..c743836 100644
--- a/src/libeis-socket.c
+++ b/src/libeis-socket.c
@@ -147,7 +147,7 @@ eis_setup_backend_socket(struct eis *eis, const char *socketpath)
 	 * socket file. */
 	_cleanup_free_ char *lockfile = xaprintf("%s.lock", path);
 	_cleanup_close_ int lockfd =
-		open(lockfile, O_CREAT | O_CLOEXEC | O_RDWR, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
+		open(lockfile, O_CREAT | O_CLOEXEC | O_RDWR, S_IRUSR | S_IWUSR);
 	int rc = flock(lockfd, LOCK_EX | LOCK_NB);
 	if (rc < 0) {
 		log_error(eis, "Failed to create lockfile %s, is another EIS running?", lockfile);