diff --git a/static/js/pandora/UI.js b/static/js/pandora/UI.js
index f820a0ca..8f309a8f 100644
--- a/static/js/pandora/UI.js
+++ b/static/js/pandora/UI.js
@@ -1,4 +1,5 @@
 // vim: et:ts=4:sw=4:sts=4:ft=javascript
+'use strict';
 
 pandora.UI = (function() {
 
diff --git a/static/js/pandora/annotationDialog.js b/static/js/pandora/annotationDialog.js
index 135a7f9e..0d16b870 100644
--- a/static/js/pandora/annotationDialog.js
+++ b/static/js/pandora/annotationDialog.js
@@ -1,4 +1,5 @@
 // vim: et:ts=4:sw=4:sts=4:ft=javascript
+'use strict';
 
 pandora.ui.annotationDialog = function(layer) {
     var $dialog = Ox.Dialog({
@@ -40,4 +41,4 @@ pandora.ui.annotationDialog = function(layer) {
         title: Ox.toTitleCase(layer)
     });
     return $dialog;
-};
\ No newline at end of file
+};
diff --git a/static/js/pandora/item.js b/static/js/pandora/item.js
index 3cb5fd7f..b6681c7e 100644
--- a/static/js/pandora/item.js
+++ b/static/js/pandora/item.js
@@ -1,4 +1,5 @@
 // vim: et:ts=4:sw=4:sts=4:ft=javascript
+'use strict';
 
 pandora.ui.item = function() {
 
diff --git a/static/js/pandora/list.js b/static/js/pandora/list.js
index 1aaed7ef..dc5c138a 100644
--- a/static/js/pandora/list.js
+++ b/static/js/pandora/list.js
@@ -1,4 +1,5 @@
 // vim: et:ts=4:sw=4:sts=4:ft=javascript
+'use strict';
 
 pandora.ui.list = function() {
     var that,
diff --git a/static/js/pandora/menu.js b/static/js/pandora/menu.js
index e6e0094b..bfd9f6f5 100644
--- a/static/js/pandora/menu.js
+++ b/static/js/pandora/menu.js
@@ -1,4 +1,5 @@
 // vim: et:ts=4:sw=4:sts=4:ft=javascript
+'use strict';
 pandora.ui.mainMenu = function() {
 
     var isAdmin = pandora.user.level == 'admin',