diff --git a/docs/assets/css/bootstrap.css b/docs/assets/css/bootstrap.css
index f69943c671..8cd2d9e362 100644
--- a/docs/assets/css/bootstrap.css
+++ b/docs/assets/css/bootstrap.css
@@ -535,9 +535,7 @@ input[type="image"], input[type="checkbox"], input[type="radio"] {
   line-height: normal;
   border: none;
   cursor: pointer;
-  -webkit-border-radius: 0;
-  -moz-border-radius: 0;
-  border-radius: 0;
+  border-radius: 0 \0/;
 }
 input[type="file"] {
   padding: initial;
diff --git a/less/forms.less b/less/forms.less
index b8cb48b480..9565c52d7f 100644
--- a/less/forms.less
+++ b/less/forms.less
@@ -86,7 +86,7 @@ input[type="radio"] {
   line-height: normal;
   border: none;
   cursor: pointer;
-  .border-radius(0);
+  border-radius: 0 e("\0/");
 }
 
 // Reset the file input to browser defaults