diff --git a/less/mixins.less b/less/mixins.less
index e76d8d697d..dff49cb4d3 100644
--- a/less/mixins.less
+++ b/less/mixins.less
@@ -392,7 +392,7 @@
 
 // Panels
 // -------------------------
-.panel-variant(@border; @heading-text-color; @heading-bg-color; @heading-border;) {
+.panel-variant(@border; @heading-text-color; @heading-bg-color; @heading-border) {
   border-color: @border;
 
   & > .panel-heading {