diff --git a/tests/testinput.c b/tests/testinput.c
index 5d353bd7c6..c7149a8386 100644
--- a/tests/testinput.c
+++ b/tests/testinput.c
@@ -213,7 +213,7 @@ static gint
 motion_notify_event (GtkWidget *widget, GdkEventMotion *event)
 {
   GdkTimeCoord **events;
-  guint n_events;
+  gint n_events;
   int i;
 
   current_device = event->device;