diff --git a/src/Listeners/UpdateJobMetrics.php b/src/Listeners/UpdateJobMetrics.php
index 67e7b4ef..7b8b12f6 100644
--- a/src/Listeners/UpdateJobMetrics.php
+++ b/src/Listeners/UpdateJobMetrics.php
@@ -47,7 +47,7 @@ public function handle(JobDeleted $event)
             return;
         }
 
-        $time = $this->watch->check($event->payload->id());
+        $time = $this->watch->check($id = $event->payload->id());
 
         $this->metrics->incrementQueue(
             $event->job->getQueue(), $time
@@ -56,5 +56,7 @@ public function handle(JobDeleted $event)
         $this->metrics->incrementJob(
             $event->payload->displayName(), $time
         );
+
+        $this->watch->forget($id);
     }
 }
diff --git a/src/Stopwatch.php b/src/Stopwatch.php
index 2317b3d4..bfee758f 100644
--- a/src/Stopwatch.php
+++ b/src/Stopwatch.php
@@ -34,4 +34,15 @@ public function check($key)
             return round((microtime(true) - $this->timers[$key]) * 1000, 2);
         }
     }
+
+    /**
+     * Forget a given timer.
+     *
+     * @param  string  $key
+     * @return void
+     */
+    public function forget($key)
+    {
+        unset($this->timers[$key]);
+    }
 }