diff --git a/src/proto/os_macosx.pro b/src/proto/os_macosx.pro
new file mode 100644
index 0000000..5b96b75
--- /dev/null
+++ b/src/proto/os_macosx.pro
@@ -0,0 +1,7 @@
+/* os_macosx.m */
+void process_cfrunloop();
+bool sound_mch_play(const char_u* event, long sound_id, soundcb_T *callback, bool playfile);
+void sound_mch_stop(long sound_id);
+void sound_mch_clear();
+void sound_mch_free();
+/* vim: set ft=c : */