diff --git a/tests/testgtk.c b/tests/testgtk.c
index f7aee23ef0..eeb8c1794b 100644
--- a/tests/testgtk.c
+++ b/tests/testgtk.c
@@ -5630,7 +5630,7 @@ static void
 screen_display_check (GtkWidget *widget, ScreenDisplaySelection *data)
 {
   const gchar *display_name;
-  GdkDisplay *display = gtk_widget_get_display (widget);
+  GdkDisplay *display;
   GtkWidget *dialog;
   GdkScreen *new_screen = NULL;
   GdkScreen *current_screen = gtk_widget_get_screen (widget);