diff --git a/background.js b/background.js
index 95b97b82..351948e4 100644
--- a/background.js
+++ b/background.js
@@ -188,7 +188,7 @@ function fixBoolean(b) {
 	return null;
 }
 
-const namespacePattern = /^\s*(@namespace[^;]+;\s*)+$/;
+var namespacePattern = /^\s*(@namespace[^;]+;\s*)+$/;
 function getApplicableSections(style, url) {
 	var sections = style.sections.filter(function(section) {
 		return sectionAppliesToUrl(section, url);
diff --git a/edit.js b/edit.js
index 39c6f0bf..62ea7f2a 100644
--- a/edit.js
+++ b/edit.js
@@ -607,7 +607,7 @@ function initHooks() {
 }
 
 function updateTitle() {
-	const DIRTY_TITLE = "* $";
+	var DIRTY_TITLE = "* $";
 
 	var name = document.getElementById("name").savedValue;
 	var clean = isCleanGlobal();