diff --git a/src/android/i_sound.c b/src/android/i_sound.c
index 9d4717a7d..2559737dc 100644
--- a/src/android/i_sound.c
+++ b/src/android/i_sound.c
@@ -194,10 +194,17 @@ void I_StopFadingMusic(void)
 {
 }
 
-boolean I_FadeMusicFromLevel(UINT8 target_volume, INT16 source_volume, UINT32 ms)
+boolean I_FadeMusicFromLevel(UINT8 target_volume, UINT16 source_volume, UINT32 ms)
 {
 	(void)target_volume;
 	(void)source_volume;
 	(void)ms;
         return false;
 }
+
+boolean I_FadeMusic(UINT8 target_volume, UINT32 ms)
+{
+	(void)target_volume;
+	(void)ms;
+	return false;
+}
diff --git a/src/djgppdos/i_sound.c b/src/djgppdos/i_sound.c
index 3d207784e..173cbef90 100644
--- a/src/djgppdos/i_sound.c
+++ b/src/djgppdos/i_sound.c
@@ -602,10 +602,17 @@ void I_StopFadingMusic(void)
 {
 }
 
-boolean I_FadeMusicFromLevel(UINT8 target_volume, INT16 source_volume, UINT32 ms)
+boolean I_FadeMusicFromLevel(UINT8 target_volume, UINT16 source_volume, UINT32 ms)
 {
 	(void)target_volume;
 	(void)source_volume;
 	(void)ms;
 	return false;
 }
+
+boolean I_FadeMusic(UINT8 target_volume, UINT32 ms)
+{
+	(void)target_volume;
+	(void)ms;
+	return false;
+}
diff --git a/src/dummy/i_sound.c b/src/dummy/i_sound.c
index aefcc4e9a..15bcb3742 100644
--- a/src/dummy/i_sound.c
+++ b/src/dummy/i_sound.c
@@ -155,7 +155,7 @@ void I_StopFadingMusic(void)
 {
 }
 
-boolean I_FadeMusicFromLevel(UINT8 target_volume, INT16 source_volume, UINT32 ms)
+boolean I_FadeMusicFromLevel(UINT8 target_volume, UINT16 source_volume, UINT32 ms)
 {
 	(void)target_volume;
 	(void)source_volume;
@@ -163,6 +163,13 @@ boolean I_FadeMusicFromLevel(UINT8 target_volume, INT16 source_volume, UINT32 ms
 	return false;
 }
 
+boolean I_FadeMusic(UINT8 target_volume, UINT32 ms)
+{
+	(void)target_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 29beca86f..ee4d7fcc9 100644
--- a/src/sdl/sdl_sound.c
+++ b/src/sdl/sdl_sound.c
@@ -2031,7 +2031,7 @@ void I_StopFadingMusic(void)
 {
 }
 
-boolean I_FadeMusicFromLevel(UINT8 target_volume, INT16 source_volume, UINT32 ms)
+boolean I_FadeMusicFromLevel(UINT8 target_volume, UINT16 source_volume, UINT32 ms)
 {
 	(void)target_volume;
 	(void)source_volume;
@@ -2039,6 +2039,13 @@ boolean I_FadeMusicFromLevel(UINT8 target_volume, INT16 source_volume, UINT32 ms
 	return false;
 }
 
+boolean I_FadeMusic(UINT8 target_volume, UINT32 ms)
+{
+	(void)target_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 c3c51323e..1be930b37 100644
--- a/src/win32/win_snd.c
+++ b/src/win32/win_snd.c
@@ -882,7 +882,7 @@ void I_StopFadingMusic(void)
 {
 }
 
-boolean I_FadeMusicFromLevel(UINT8 target_volume, INT16 source_volume, UINT32 ms)
+boolean I_FadeMusicFromLevel(UINT8 target_volume, UINT16 source_volume, UINT32 ms)
 {
 	(void)target_volume;
 	(void)source_volume;
@@ -890,6 +890,13 @@ boolean I_FadeMusicFromLevel(UINT8 target_volume, INT16 source_volume, UINT32 ms
 	return false;
 }
 
+boolean I_FadeMusic(UINT8 target_volume, UINT32 ms)
+{
+	(void)target_volume;
+	(void)ms;
+	return false;
+}
+
 //
 // Fuck MIDI. ... Okay fine, you can have your silly D_-only mode.
 //