diff --git a/bench/action.go b/bench/action.go
index a77f3df0..0b1a487e 100644
--- a/bench/action.go
+++ b/bench/action.go
@@ -66,7 +66,7 @@ func GetOrganizerPlayersListAction(ctx context.Context, ag *agent.Agent) (*http.
 func PostOrganizerPlayersAddAction(ctx context.Context, playerDisplayNames []string, ag *agent.Agent) (*http.Response, error) {
 	form := url.Values{}
 	for _, displayName := range playerDisplayNames {
-		form.Add("display_name", displayName)
+		form.Add("display_name[]", displayName)
 	}
 	req, err := ag.POST("/api/organizer/players/add", strings.NewReader(form.Encode()))
 	if err != nil {
diff --git a/webapp/go/isuports.go b/webapp/go/isuports.go
index 8d4e97ad..c3bb7d47 100644
--- a/webapp/go/isuports.go
+++ b/webapp/go/isuports.go
@@ -784,7 +784,7 @@ func playersAddHandler(c echo.Context) error {
 	if err != nil {
 		return fmt.Errorf("error c.FormParams: %w", err)
 	}
-	displayNames := params["display_name"]
+	displayNames := params["display_name[]"]
 
 	pds := make([]PlayerDetail, 0, len(displayNames))
 	for _, displayName := range displayNames {