diff --git a/extensions/markdown/less/forum.less b/extensions/markdown/less/forum.less
index 9fb25de3e..87908f8f1 100644
--- a/extensions/markdown/less/forum.less
+++ b/extensions/markdown/less/forum.less
@@ -1,5 +1,5 @@
 .MarkdownToolbar {
-  display: 'inline-block';
+  display: inline-block;
 }
 
 span.spoiler {