diff --git a/edit.js b/edit.js
index 3ea0dcf0..9ac64449 100644
--- a/edit.js
+++ b/edit.js
@@ -289,7 +289,7 @@ function acmeEventListener(event) {
 				el.selectedIndex = 0;
 				break;
 			}
-			var url = chrome.extension.getURL("codemirror/theme/" + value + ".css");
+			var url = chrome.runtime.getURL("codemirror/theme/" + value + ".css");
 			if (themeLink.href == url) { // preloaded in initCodeMirror()
 				break;
 			}