diff --git a/core/js/js.js b/core/js/js.js
index 73a9c32a91..e306e2a736 100644
--- a/core/js/js.js
+++ b/core/js/js.js
@@ -1354,7 +1354,9 @@ function initCore() {
 
 	// css variables fallback for IE
 	if (msie > 0 || trident > 0) {
-		cssVars();
+		cssVars({
+			watch: true
+		});
 	}
 
 	$(window).on('unload.main', function() {