diff --git a/test/test-pointer.c b/test/test-pointer.c
index 25cef853..6561489a 100644
--- a/test/test-pointer.c
+++ b/test/test-pointer.c
@@ -68,6 +68,7 @@ test_relative_event(struct litest_device *dev, double dx, double dy)
 	prop = udev_device_get_property_value(ud, "MOUSE_DPI");
 	if (prop) {
 		dpi = parse_mouse_dpi_property(prop);
+		ck_assert_int_ne(dpi, 0);
 
 		dx *= 1000.0/dpi;
 		dy *= 1000.0/dpi;
diff --git a/test/test-tablet.c b/test/test-tablet.c
index 5f652613..79319039 100644
--- a/test/test-tablet.c
+++ b/test/test-tablet.c
@@ -111,6 +111,8 @@ START_TEST(button_seat_count)
 	case BTN_0:
 		dev2 = litest_add_device(li, LITEST_DELL_CANVAS_TOTEM);
 		break;
+	default:
+		ck_abort();
 	}
 
 	litest_tablet_proximity_in(dev, 10, 10, axes);