diff --git a/extern/pwrnoise/pwrnoise.c b/extern/pwrnoise/pwrnoise.c
index 93a47a701..40ef9a6ab 100644
--- a/extern/pwrnoise/pwrnoise.c
+++ b/extern/pwrnoise/pwrnoise.c
@@ -120,7 +120,7 @@ void pwrnoise_slope_step(slope_channel_t *chan, uint16_t cycles, bool force_zero
 				chan->accum &= 0x7f;
 				
 				if (++chan->a > chan->alength) {
-					if ((chan->flags & 0x04) != 0) chan->accum = (chan->flags & 0x02) ? 0x7f : 0x00;
+					if ((chan->flags & 0x04) != 0) chan->accum = (chan->flags & 0x01) ? 0x7f : 0x00;
 					chan->b = 0x00;
 					chan->portion = true;
 				}
@@ -133,7 +133,7 @@ void pwrnoise_slope_step(slope_channel_t *chan, uint16_t cycles, bool force_zero
 				chan->accum &= 0x7f;
 				
 				if (++chan->b > chan->blength) {
-					if ((chan->flags & 0x08) != 0) chan->accum = (chan->flags & 0x01) ? 0x7f : 0x00;
+					if ((chan->flags & 0x08) != 0) chan->accum = (chan->flags & 0x02) ? 0x7f : 0x00;
 					chan->a = 0x00;
 					chan->portion = false;
 				}