diff --git a/src/cluster.h b/src/cluster.h
index 01e1ce21..b861dc14 100644
--- a/src/cluster.h
+++ b/src/cluster.h
@@ -219,7 +219,7 @@ union clusterMsgData {
     } update;
 };
 
-#define CLUSTER_PROTO_VER 0 /* Cluster bus protocol version. */
+#define CLUSTER_PROTO_VER 1 /* Cluster bus protocol version. */
 
 typedef struct {
     char sig[4];        /* Siganture "RCmb" (Redis Cluster message bus). */
@@ -237,7 +237,8 @@ typedef struct {
     char sender[CLUSTER_NAMELEN]; /* Name of the sender node */
     unsigned char myslots[CLUSTER_SLOTS/8];
     char slaveof[CLUSTER_NAMELEN];
-    char notused1[32];  /* 32 bytes reserved for future usage. */
+    char myip[NET_IP_STR_LEN];    /* Sender IP, if not all zeroed. */
+    char notused1[34];  /* 34 bytes reserved for future usage. */
     uint16_t port;      /* Sender TCP base port */
     uint16_t flags;     /* Sender node flags */
     unsigned char state; /* Cluster state from the POV of the sender */