diff --git a/src/cluster_legacy.c b/src/cluster_legacy.c
index 9a23527b30..3d838dfe06 100644
--- a/src/cluster_legacy.c
+++ b/src/cluster_legacy.c
@@ -4361,7 +4361,7 @@ void clusterRequestFailoverAuth(void) {
     /* If this is a manual failover, set the CLUSTERMSG_FLAG0_FORCEACK bit
      * in the header to communicate the nodes receiving the message that
      * they should authorized the failover even if the primary is working. */
-    if (server.cluster->mf_end) getMessageFromSendBlock(msgblock)->mflags[0] |= CLUSTERMSG_FLAG0_FORCEACK;
+    if (server.cluster->mf_end) msgblock->data[0].msg.mflags[0] |= CLUSTERMSG_FLAG0_FORCEACK;
     clusterBroadcastMessage(msgblock);
     clusterMsgSendBlockDecrRefCount(msgblock);
 }