diff --git a/src/Illuminate/Cache/ArrayStore.php b/src/Illuminate/Cache/ArrayStore.php
index cf95fe31a900..f1f00d637be9 100644
--- a/src/Illuminate/Cache/ArrayStore.php
+++ b/src/Illuminate/Cache/ArrayStore.php
@@ -110,9 +110,13 @@ public function forever($key, $value)
      */
     public function forget($key)
     {
-        unset($this->storage[$key]);
+        if (array_key_exists($key, $this->storage)) {
+            unset($this->storage[$key]);
 
-        return true;
+            return true;
+        }
+
+        return false;
     }
 
     /**
diff --git a/tests/Cache/CacheArrayStoreTest.php b/tests/Cache/CacheArrayStoreTest.php
index 09303f01238d..6259f5cb5e43 100755
--- a/tests/Cache/CacheArrayStoreTest.php
+++ b/tests/Cache/CacheArrayStoreTest.php
@@ -87,8 +87,9 @@ public function testItemsCanBeRemoved()
     {
         $store = new ArrayStore;
         $store->put('foo', 'bar', 10);
-        $store->forget('foo');
+        $this->assertTrue($store->forget('foo'));
         $this->assertNull($store->get('foo'));
+        $this->assertFalse($store->forget('foo'));
     }
 
     public function testItemsCanBeFlushed()