diff --git a/scss/_modal.scss b/scss/_modal.scss
index 046810f5f482..c88d085c9ef8 100644
--- a/scss/_modal.scss
+++ b/scss/_modal.scss
@@ -49,7 +49,7 @@
   background-color: $modal-content-bg;
   background-clip: padding-box;
   border: 1px solid $modal-content-border-color;
-  border-radius: $border-radius-lg;
+  @include border-radius($border-radius-lg);
   @include box-shadow(0 3px 9px rgba(0,0,0,.5));
   // Remove focus outline from opened modal
   outline: 0;