diff --git a/scss/_buttons.scss b/scss/_buttons.scss
index 05c54e4ee012541ce3c5ea7de606b444c6b97588..fdbb735d99fc192d0b822eb4a379c53c64a6e8e1 100644
--- a/scss/_buttons.scss
+++ b/scss/_buttons.scss
@@ -22,7 +22,7 @@
   &:focus,
   &.focus {
     outline: 0;
-    box-shadow: $btn-focus-box-shadow;
+    @include box-shadow($btn-focus-box-shadow);
   }
 
   // Disabled comes first so active can properly restyle