diff --git a/less/modals.less b/less/modals.less
index f886fb25ce..624ba1ea50 100644
--- a/less/modals.less
+++ b/less/modals.less
@@ -125,7 +125,7 @@
 }
 
 // Scale up the modal
-@media screen and (min-width: @screen-sm) {
+@media screen and (min-width: @screen-sm-min) {
 
   .modal-dialog {
     left: 50%;