diff --git a/lib/modifiedDOMRectAPI.js b/lib/modifiedDOMRectAPI.js
index 09a1a53..e8ae2bd 100644
--- a/lib/modifiedDOMRectAPI.js
+++ b/lib/modifiedDOMRectAPI.js
@@ -195,7 +195,7 @@
 						if (registration){
 							const fakeDomRect = getFakeDomRect(window, this, prefs, registration.notify);
 							registeredRects.delete(getWrapped(this));
-							["x", "y", "width", "height"].forEach(function(prop){
+							["x", "y", "width", "height"].forEach((prop) => {
 								if (prop === property){
 									this[prop] = newValue;
 								}