diff --git a/src/wp-admin/options-discussion.php b/src/wp-admin/options-discussion.php
index ed44128dd9..41450fc4d8 100644
--- a/src/wp-admin/options-discussion.php
+++ b/src/wp-admin/options-discussion.php
@@ -272,7 +272,9 @@ foreach ( $avatar_defaults as $default_key => $default_name ) {
 	$avatar_list .= "\n\t<label><input type='radio' name='avatar_default' id='avatar_{$default_key}' value='" . esc_attr($default_key) . "' {$selected}/> ";
 
 	$avatar = get_avatar( $user_email, $size, $default_key );
-	$avatar_list .= preg_replace("/src='(.+?)'/", "src='\$1&amp;forcedefault=1'", $avatar);
+	$avatar = preg_replace( "/src='(.+?)'/", "src='\$1&amp;forcedefault=1'", $avatar );
+	$avatar = preg_replace( "/srcset='(.+?) 2x'/", "srcset='\$1&amp;forcedefault=1 2x'", $avatar );
+	$avatar_list .= $avatar;
 
 	$avatar_list .= ' ' . $default_name . '</label>';
 	$avatar_list .= '<br />';