diff --git a/include/linux/kbd_kern.h b/include/linux/kbd_kern.h
index 506ad20..8bdb16b 100644
--- a/include/linux/kbd_kern.h
+++ b/include/linux/kbd_kern.h
@@ -161,4 +161,7 @@
 	schedule_delayed_work(&t->buf.work, 0);
 }
 
+/* mac_hid.c */
+extern int mac_hid_mouse_emulate_buttons(int, unsigned int, int);
+
 #endif