diff --git a/src/cluster.c b/src/cluster.c
index 7aad66542ba6cab165685114d6855c00154301eb..4751c78f7d450480126c12b13685b9ecbea0fc43 100644
--- a/src/cluster.c
+++ b/src/cluster.c
@@ -231,6 +231,7 @@ int clusterSaveConfig(void) {
     if ((fd = open(server.cluster_configfile,O_WRONLY|O_CREAT|O_TRUNC,0644))
         == -1) goto err;
     if (write(fd,ci,sdslen(ci)) != (ssize_t)sdslen(ci)) goto err;
+    fsync(fd);
     close(fd);
     sdsfree(ci);
     return 0;