diff --git a/core/client.js b/core/client.js
index 39348308..ee3cfbd9 100644
--- a/core/client.js
+++ b/core/client.js
@@ -1820,8 +1820,8 @@ function toggleVisibleWhitespace() {
 			.cm-highlightTab {
 				background-image: unset !important;
 			}
-			.cm-highlightSpace:before {
-				content: unset !important;
+			.cm-highlightSpace {
+				background-image: unset !important;
 			}
 		`;
 		window.localStorage.setItem('visible_whitespace', '1');