diff --git a/src/RedLock.php b/src/RedLock.php
index 5f6770a..35bf80e 100644
--- a/src/RedLock.php
+++ b/src/RedLock.php
@@ -59,12 +59,14 @@ public function lock($resource, $ttl)
                 }
             }
 
-            // Wait a random delay before to retry
-            $delay = mt_rand(floor($this->retryDelay / 2), $this->retryDelay);
-            usleep($delay * 1000);
-
             $retry--;
 
+            if ($retry > 0) {
+                // Wait a random delay before to retry
+                $delay = mt_rand(floor($this->retryDelay / 2), $this->retryDelay);
+                usleep($delay * 1000);
+            }
+
         } while ($retry > 0);
 
         return false;