diff --git a/src/Illuminate/Broadcasting/Broadcasters/RedisBroadcaster.php b/src/Illuminate/Broadcasting/Broadcasters/RedisBroadcaster.php
index d3431ebd0046..a4c398ef45c2 100644
--- a/src/Illuminate/Broadcasting/Broadcasters/RedisBroadcaster.php
+++ b/src/Illuminate/Broadcasting/Broadcasters/RedisBroadcaster.php
@@ -119,6 +119,17 @@ public function broadcast(array $channels, $event, array $payload = [])
         );
     }
 
+    /**
+     * @param  array  $channels
+     * @return array
+     */
+    protected function formatChannels(array $channels)
+    {
+        return array_map(function ($channel) {
+            return $this->prefix.$channel;
+        }, parent::formatChannels($channels));
+    }
+
     /**
      * Get the Lua script for broadcasting to multiple channels.
      *