diff --git a/packages/completer/style/base.css b/packages/completer/style/base.css
index 15845a671bc7..8a7e3aa50f7f 100644
--- a/packages/completer/style/base.css
+++ b/packages/completer/style/base.css
@@ -49,7 +49,7 @@
   padding: 0;
   list-style-type: none;
   overflow-y: scroll;
-  overflow-x: auto;
+  overflow-x: hidden;
   max-height: calc((10 * var(--jp-private-completer-item-height)));
   min-height: calc(var(--jp-private-completer-item-height));
   width: 100%;