1 files changed, 5 insertions, 2 deletions
diff --git a/ui/widgets/spinner.js b/ui/widgets/spinner.js
index 6b860e785..1bd69b6d8 100644
--- a/ui/widgets/spinner.js
+++ b/ui/widgets/spinner.js
@@ -17,6 +17,8 @@
 //>>css.theme: ../../themes/base/theme.css
 
 ( function( factory ) {
+	"use strict";
+
 	if ( typeof define === "function" && define.amd ) {
 
 		// AMD. Register as an anonymous module.
@@ -33,7 +35,8 @@
 		// Browser globals
 		factory( jQuery );
 	}
-}( function( $ ) {
+} )( function( $ ) {
+"use strict";
 
 function spinnerModifier( fn ) {
 	return function() {
@@ -576,4 +579,4 @@ if ( $.uiBackCompat !== false ) {
 
 return $.ui.spinner;
 
-} ) );
+} );