diff --git a/src/plugins/discover/public/application/components/sidebar/discover_sidebar.tsx b/src/plugins/discover/public/application/components/sidebar/discover_sidebar.tsx
index c9dda909396c..9dcb5bf337cb 100644
--- a/src/plugins/discover/public/application/components/sidebar/discover_sidebar.tsx
+++ b/src/plugins/discover/public/application/components/sidebar/discover_sidebar.tsx
@@ -267,7 +267,6 @@ const FieldList = ({
     <>
       <EuiButtonEmpty
         iconSide="right"
-        iconSize="s"
         color="text"
         iconType={expanded ? 'arrowDown' : 'arrowRight'}
         onClick={() => setExpanded(!expanded)}