diff --git a/app_controller.php b/app_controller.php
index 3b49218c63..fb9d4028a1 100644
--- a/app_controller.php
+++ b/app_controller.php
@@ -130,6 +130,19 @@ public function beforeFilter() {
             Configure::write('Config.language', $this->params['locale']);
         }
     }
+/**
+ * afterFilter callback
+ * Disable debug mode on JSON pages to prevent the script execution time to be appended to the page
+ *
+ * @see http://croogo.lighthouseapp.com/projects/32818/tickets/216
+ * @return void
+ */
+	public function afterFilter() {
+		parent::afterFilter();
+		if (!empty($this->params['url']['ext']) && $this->params['url']['ext'] === 'json') {
+			Configure::write('debug', 0);
+		}
+	}
 /**
  * blackHoleCallback for SecurityComponent
  *