diff --git a/ckan/public/base/less/forms.less b/ckan/public/base/less/forms.less
index 0b07c4a49ad..5cb60231142 100644
--- a/ckan/public/base/less/forms.less
+++ b/ckan/public/base/less/forms.less
@@ -161,7 +161,6 @@ textarea {
 }
 
 .simple-input .field input {
-  .box-sizing(border-box);
   width: 100%;
   height: auto;
   margin: 0 -7px; // Pull input out into gutter