diff --git a/theme/boost/scss/moodle/core.scss b/theme/boost/scss/moodle/core.scss
index bfe738f1ca8..f5ec4ac22ff 100644
--- a/theme/boost/scss/moodle/core.scss
+++ b/theme/boost/scss/moodle/core.scss
@@ -982,12 +982,7 @@ tr.flagged-tag a {
 .smartselect.compactmenu .smartselect_submenuitem:hover > .smartselect_menuitem_label {
     font-weight: bold;
 }
-/**
-* Registration
-*/
-#page-admin-registration-register .registration_textfield {
-    width: 300px;
-}
+
 /**
 * Enrol
 */