diff --git a/common/main/digi.h b/common/main/digi.h
index 3c272e55e..75a793276 100644
--- a/common/main/digi.h
+++ b/common/main/digi.h
@@ -93,7 +93,6 @@ extern void digi_end_sound( int channel );
 extern void digi_set_channel_pan( int channel, int pan );
 extern void digi_set_channel_volume( int channel, int volume );
 extern int digi_is_channel_playing(int channel);
-extern void digi_debug();
 
 extern void digi_play_sample_looping( int soundno, fix max_volume,int loop_start, int loop_end );
 extern void digi_change_looping_volume( fix volume );
diff --git a/similar/arch/sdl/digi.cpp b/similar/arch/sdl/digi.cpp
index 2cfc8f6ec..761182071 100644
--- a/similar/arch/sdl/digi.cpp
+++ b/similar/arch/sdl/digi.cpp
@@ -177,9 +177,6 @@ void digi_select_system(int n) {
 }
 
 /* Common digi functions */
-#ifndef NDEBUG
-static int digi_initialised = 0;
-#endif
 #if defined(DXX_BUILD_DESCENT_I)
 int digi_sample_rate = SAMPLE_RATE_11K;
 #endif
@@ -213,21 +210,6 @@ int  digi_is_channel_playing(int channel) { return fptr->is_channel_playing(chan
 void digi_stop_all_channels() { fptr->stop_all_channels(); }
 void digi_set_digi_volume(int dvolume) { fptr->set_digi_volume(dvolume); }
 
-#ifndef NDEBUG
-void digi_debug()
-{
-	int n_voices = 0;
-
-	if (!digi_initialised) return;
-
-	for (int i = 0; i < digi_max_channels; i++)
-	{
-		if (digi_is_channel_playing(i))
-			n_voices++;
-        }
-}
-#endif
-
 #ifdef _WIN32
 // Windows native-MIDI stuff.
 int digi_win32_midi_song_playing=0;