diff --git a/src/RedLock.php b/src/RedLock.php
index 5f6770a..dc56416 100644
--- a/src/RedLock.php
+++ b/src/RedLock.php
@@ -18,7 +18,7 @@ function __construct(array $servers, $retryDelay = 200, $retryCount = 3)
         $this->retryDelay = $retryDelay;
         $this->retryCount = $retryCount;
 
-        $this->quorum  = min(count($servers), (count($servers) / 2 + 1));
+        $this->quorum  = min(count($servers), (intval(count($servers) / 2) + 1));
     }
 
     public function lock($resource, $ttl)