diff --git a/src/wp-includes/js/wp-emoji-loader.js b/src/wp-includes/js/wp-emoji-loader.js
index 0a9f1919b3..f242a12f26 100755
--- a/src/wp-includes/js/wp-emoji-loader.js
+++ b/src/wp-includes/js/wp-emoji-loader.js
@@ -49,6 +49,7 @@
 				 */
 				context.fillText( stringFromCharCode( 55356, 57221 ), 0, 0 );
 				tonedata = context.getImageData( 16, 16, 1, 1 ).data;
+				tone = tonedata[0] + ',' + tonedata[1] + ',' + tonedata[2] + ',' + tonedata[3];
 
 				context.fillText( stringFromCharCode( 55356, 57221, 55356, 57343 ), 0, 0 );
 				// Chrome has issues comparing arrays, and Safari has issues converting arrays to strings.