diff --git a/includes/plugins.inc b/includes/plugins.inc
index 9077d38..8e2843b 100644
--- a/includes/plugins.inc
+++ b/includes/plugins.inc
@@ -175,12 +175,12 @@ class panels_cache_object {
 
     // If there are any differences between the old and the new javascript then
     // store them to be added later.
-    if ($diff = array_diff_assoc($js, $start)) {
+    if ($diff = drupal_array_diff_assoc_recursive($js, $start)) {
       $this->js = $diff;
     }
 
     // Special case the settings key and get the difference of the data.
-    if ($settings_diff = array_diff_assoc($js['settings']['data'], $start['settings']['data'])) {
+    if ($settings_diff = drupal_array_diff_assoc_recursive($js['settings']['data'], $start['settings']['data'])) {
       $this->js['settings'] = $settings_diff;
     }
 
diff --git a/panels.info b/panels.info
index 70b961d..5aa334b 100644
--- a/panels.info
+++ b/panels.info
@@ -4,6 +4,7 @@ core = 7.x
 package = "Panels"
 configure = admin/structure/panels
 dependencies[] = ctools
+dependencies[] = system (>=7.23)
 files[] = panels.module
 files[] = includes/common.inc
 files[] = includes/legacy.inc