diff --git a/src/sentinel.c b/src/sentinel.c
index 7d174ac28..c170818c9 100644
--- a/src/sentinel.c
+++ b/src/sentinel.c
@@ -2741,6 +2741,12 @@ void sentinelCommand(redisClient *c) {
             != REDIS_OK) return;
         if (getLongFromObjectOrReply(c,c->argv[4],&port,"Invalid port")
             != REDIS_OK) return;
+
+        if (quorum <= 0) {
+            addReplyError(c, "Quorum must be 1 or greater.");
+            return;
+        }
+
         /* Make sure the IP field is actually a valid IP before passing it
          * to createSentinelRedisInstance(), otherwise we may trigger a
          * DNS lookup at runtime. */