diff --git a/src/cluster.c b/src/cluster.c
index dfba1841..8c6c2112 100644
--- a/src/cluster.c
+++ b/src/cluster.c
@@ -2596,7 +2596,7 @@ int getSlotOrReply(redisClient *c, robj *o) {
     long long slot;
 
     if (getLongLongFromObject(o,&slot) != REDIS_OK ||
-        slot < 0 || slot > REDIS_CLUSTER_SLOTS)
+        slot < 0 || slot >= REDIS_CLUSTER_SLOTS)
     {
         addReplyError(c,"Invalid or out of range slot");
         return -1;