diff --git a/src/wp-includes/js/wp-emoji-loader.js b/src/wp-includes/js/wp-emoji-loader.js
index 327f66a19b..83f431cc92 100755
--- a/src/wp-includes/js/wp-emoji-loader.js
+++ b/src/wp-includes/js/wp-emoji-loader.js
@@ -13,6 +13,7 @@
 	function browserSupportsEmoji( type ) {
 		var canvas = document.createElement( 'canvas' ),
 			context = canvas.getContext && canvas.getContext( '2d' ),
+			stringFromCharCode = String.fromCharCode,
 			tone;
 
 		if ( ! context || ! context.fillText ) {
@@ -37,7 +38,7 @@
 			 * The first two will encode to small images (1-2KB data URLs), the third will encode
 			 * to a larger image (4-5KB data URL).
 			 */
-			context.fillText( String.fromCharCode( 55356, 56806, 55356, 56826 ), 0, 0 );
+			context.fillText( stringFromCharCode( 55356, 56806, 55356, 56826 ), 0, 0 );
 			return canvas.toDataURL().length > 3000;
 		} else if ( 'diversity' === type ) {
 			/*
@@ -45,9 +46,9 @@
 			 * emoji with no skin tone specified (in this case, Santa). It then adds a skin tone, and
 			 * compares if the emoji rendering has changed.
 			 */
-			context.fillText( String.fromCharCode( 55356, 57221 ), 0, 0 );
+			context.fillText( stringFromCharCode( 55356, 57221 ), 0, 0 );
 			tone = context.getImageData( 16, 16, 1, 1 ).data.toString();
-			context.fillText( String.fromCharCode( 55356, 57221, 55356, 57343 ), 0, 0 );
+			context.fillText( stringFromCharCode( 55356, 57221, 55356, 57343 ), 0, 0 );
 			// Chrome has issues comparing arrays, so we compare it as a  string, instead.
 			return tone !== context.getImageData( 16, 16, 1, 1 ).data.toString();
 		} else {
@@ -57,13 +58,13 @@
 				 * center pixel. In browsers that don't support emoji, the character will be rendered
 				 * as an empty square, so the center pixel will be blank.
 				 */
-				context.fillText( String.fromCharCode( 55357, 56835 ), 0, 0 );
+				context.fillText( stringFromCharCode( 55357, 56835 ), 0, 0 );
 			} else {
 				/*
 				 * To check for Unicode 8 support, let's try rendering the most important advancement
 				 * that the Unicode Consortium have made in years: the burrito.
 				 */
-				context.fillText( String.fromCharCode( 55356, 57135 ), 0, 0 );
+				context.fillText( stringFromCharCode( 55356, 57135 ), 0, 0 );
 			}
 			return context.getImageData( 16, 16, 1, 1 ).data[0] !== 0;
 		}