diff --git a/test/litest.c b/test/litest.c
index 21ddca20..e39af5f8 100644
--- a/test/litest.c
+++ b/test/litest.c
@@ -1457,7 +1457,7 @@ litest_create_uinput_device(const char *name, struct input_id *id, ...)
 
 struct libinput_event_pointer*
 litest_is_button_event(struct libinput_event *event,
-		       int button,
+		       unsigned int button,
 		       enum libinput_button_state state)
 {
 	struct libinput_event_pointer *ptrev;
diff --git a/test/litest.h b/test/litest.h
index 23a8e879..83859c2d 100644
--- a/test/litest.h
+++ b/test/litest.h
@@ -198,7 +198,7 @@ void litest_drain_events(struct libinput *li);
 void litest_assert_empty_queue(struct libinput *li);
 struct libinput_event_pointer * litest_is_button_event(
 		       struct libinput_event *event,
-		       int button,
+		       unsigned int button,
 		       enum libinput_button_state state);
 void litest_assert_button_event(struct libinput *li,
 				unsigned int button,