diff --git a/libs/audio/renderer/snd_mix.c b/libs/audio/renderer/snd_mix.c
index 61cccb870..9e44bae7a 100644
--- a/libs/audio/renderer/snd_mix.c
+++ b/libs/audio/renderer/snd_mix.c
@@ -421,6 +421,10 @@ SND_PaintChannelFrom8 (channel_t *ch, sfxbuffer_t *sc, int count)
 	byte       *samps;
 
 	pos = (ch->pos - sc->pos + sc->tail) % sc->length;
+	if (pos < 0) {		// FIXME need a better way to handle shared streams
+		pos = sc->tail;
+		ch->pos = sc->pos;
+	}
 	samps = sc->data + pos;
 
 	if (pos + count > sc->length) {
@@ -440,6 +444,10 @@ SND_PaintChannelFrom16 (channel_t *ch, sfxbuffer_t *sc, int count)
 	short      *samps;
 
 	pos = (ch->pos - sc->pos + sc->tail) % sc->length;
+	if (pos < 0) {		// FIXME need a better way to handle shared streams
+		pos = sc->tail;
+		ch->pos = sc->pos;
+	}
 	samps = (short *) sc->data + pos;
 
 	if (pos + count > sc->length) {
@@ -459,6 +467,10 @@ SND_PaintChannelStereo8 (channel_t *ch, sfxbuffer_t *sc, int count)
 	short      *samps;
 
 	pos = (ch->pos - sc->pos + sc->tail) % sc->length;
+	if (pos < 0) {		// FIXME need a better way to handle shared streams
+		pos = sc->tail;
+		ch->pos = sc->pos;
+	}
 	samps = (short *) sc->data + pos;
 
 	if (pos + count > sc->length) {
@@ -478,6 +490,10 @@ SND_PaintChannelStereo16 (channel_t *ch, sfxbuffer_t *sc, int count)
 	int        *samps;
 
 	pos = (ch->pos - sc->pos + sc->tail) % sc->length;
+	if (pos < 0) {		// FIXME need a better way to handle shared streams
+		pos = sc->tail;
+		ch->pos = sc->pos;
+	}
 	samps = (int *) sc->data + pos;
 
 	if (pos + count > sc->length) {