diff --git a/theme/bootstrapbase/less/moodle/forms.less b/theme/bootstrapbase/less/moodle/forms.less
index 3087c476dd9..de3515953c5 100644
--- a/theme/bootstrapbase/less/moodle/forms.less
+++ b/theme/bootstrapbase/less/moodle/forms.less
@@ -524,3 +524,7 @@ input[size] {
     padding: 0.5em;
     font-size: large;
 }
+
+textarea[data-auto-rows] {
+    overflow-x: hidden;
+}
diff --git a/theme/bootstrapbase/style/moodle.css b/theme/bootstrapbase/style/moodle.css
index 5671bf2d682..51af3a0bc0f 100644
--- a/theme/bootstrapbase/style/moodle.css
+++ b/theme/bootstrapbase/style/moodle.css
@@ -14155,6 +14155,9 @@ input[size] {
   padding: 0.5em;
   font-size: large;
 }
+textarea[data-auto-rows] {
+  overflow-x: hidden;
+}
 body.modal-open {
   overflow: hidden;
 }