diff --git a/src/android/i_sound.c b/src/android/i_sound.c
index 48831956a..9d4717a7d 100644
--- a/src/android/i_sound.c
+++ b/src/android/i_sound.c
@@ -189,3 +189,15 @@ void I_SetInternalMusicVolume(UINT8 volume)
 {
 	(void)volume;
 }
+
+void I_StopFadingMusic(void)
+{
+}
+
+boolean I_FadeMusicFromLevel(UINT8 target_volume, INT16 source_volume, UINT32 ms)
+{
+	(void)target_volume;
+	(void)source_volume;
+	(void)ms;
+        return false;
+}
diff --git a/src/djgppdos/i_sound.c b/src/djgppdos/i_sound.c
index f722bec00..3d207784e 100644
--- a/src/djgppdos/i_sound.c
+++ b/src/djgppdos/i_sound.c
@@ -597,3 +597,15 @@ void I_SetInternalMusicVolume(UINT8 volume)
 {
 	(void)volume;
 }
+
+void I_StopFadingMusic(void)
+{
+}
+
+boolean I_FadeMusicFromLevel(UINT8 target_volume, INT16 source_volume, UINT32 ms)
+{
+	(void)target_volume;
+	(void)source_volume;
+	(void)ms;
+	return false;
+}
diff --git a/src/dummy/i_sound.c b/src/dummy/i_sound.c
index b464079b2..aefcc4e9a 100644
--- a/src/dummy/i_sound.c
+++ b/src/dummy/i_sound.c
@@ -151,6 +151,18 @@ void I_SetInternalMusicVolume(UINT8 volume)
 	(void)volume;
 }
 
+void I_StopFadingMusic(void)
+{
+}
+
+boolean I_FadeMusicFromLevel(UINT8 target_volume, INT16 source_volume, UINT32 ms)
+{
+	(void)target_volume;
+	(void)source_volume;
+	(void)ms;
+	return false;
+}
+
 UINT32 I_GetMusicLength(void)
 {
 	return 0;
diff --git a/src/sdl/sdl_sound.c b/src/sdl/sdl_sound.c
index 6b6674cd7..29beca86f 100644
--- a/src/sdl/sdl_sound.c
+++ b/src/sdl/sdl_sound.c
@@ -1664,11 +1664,6 @@ musictype_t I_MusicType(void)
 	return MU_NONE;
 }
 
-void I_SetInternalMusicVolume(UINT8 volume)
-{
-	(void)volume;
-}
-
 
 void I_UnRegisterSong(INT32 handle)
 {
@@ -2032,6 +2027,18 @@ void I_SetInternalMusicVolume(UINT8 volume)
 	(void)volume;
 }
 
+void I_StopFadingMusic(void)
+{
+}
+
+boolean I_FadeMusicFromLevel(UINT8 target_volume, INT16 source_volume, UINT32 ms)
+{
+	(void)target_volume;
+	(void)source_volume;
+	(void)ms;
+	return false;
+}
+
 #ifdef MIXER_POS
 static void SDLCALL I_FinishMusic(void)
 {
diff --git a/src/win32/win_snd.c b/src/win32/win_snd.c
index bc5ab4ad7..c3c51323e 100644
--- a/src/win32/win_snd.c
+++ b/src/win32/win_snd.c
@@ -878,6 +878,18 @@ void I_SetInternalMusicVolume(UINT8 volume)
 	(void)volume;
 }
 
+void I_StopFadingMusic(void)
+{
+}
+
+boolean I_FadeMusicFromLevel(UINT8 target_volume, INT16 source_volume, UINT32 ms)
+{
+	(void)target_volume;
+	(void)source_volume;
+	(void)ms;
+	return false;
+}
+
 //
 // Fuck MIDI. ... Okay fine, you can have your silly D_-only mode.
 //