Hook up axis events.
diff --git a/clients/window.c b/clients/window.c
index 5d33a3c..49b0188 100644
--- a/clients/window.c
+++ b/clients/window.c
@@ -1521,6 +1521,13 @@
 }
 
 static void
+input_handle_axis(void *data,
+		    struct wl_input_device *input_device,
+		    uint32_t time, uint32_t axis, int32_t value)
+{
+}
+
+static void
 input_handle_key(void *data, struct wl_input_device *input_device,
 		 uint32_t time, uint32_t key, uint32_t state)
 {
@@ -1690,6 +1697,7 @@
 static const struct wl_input_device_listener input_device_listener = {
 	input_handle_motion,
 	input_handle_button,
+	input_handle_axis,
 	input_handle_key,
 	input_handle_pointer_enter,
 	input_handle_pointer_leave,