diff --git a/src/sdl/sdl_sound.c b/src/sdl/sdl_sound.c
index 929ac79f5211b2acb80db9251c2262c289c0fb90..5c93642bda0ef24dd3f9b93cee4ec5f61130cce8 100644
--- a/src/sdl/sdl_sound.c
+++ b/src/sdl/sdl_sound.c
@@ -1409,6 +1409,9 @@ UINT32 I_GetSongPosition(void)
 	return 0;
 }
 
+void I_UpdateSongLagThreshold (void) {}
+void I_UpdateSongLagConditions (void) {}
+
 /// ------------------------
 //  MUSIC PLAYBACK
 /// ------------------------