diff --git a/sys/dev/sound/pcm/feeder_eq.c b/sys/dev/sound/pcm/feeder_eq.c
--- a/sys/dev/sound/pcm/feeder_eq.c
+++ b/sys/dev/sound/pcm/feeder_eq.c
@@ -132,17 +132,18 @@
 	struct feed_eq_coeff_tone *treble, *bass;
 	intpcm64_t w;
 	intpcm_t v;
-	uint32_t i, j;
+	uint32_t i, j, bps;
 	int32_t pmul, pshift;
 
 	pmul = feed_eq_preamp[info->preamp].mul;
 	pshift = feed_eq_preamp[info->preamp].shift;
+	bps = AFMT_BPS(info->fmt);
 
 	if (info->state == FEEDEQ_DISABLE) {
 		j = count * info->channels;
-		dst += j * AFMT_BPS(info->fmt);
+		dst += j * bps;
 		do {
-			dst -= AFMT_BPS(info->fmt);
+			dst -= bps;
 			v = pcm_sample_read(dst, info->fmt, false);
 			v = ((intpcm64_t)pmul * v) >> pshift;
 			pcm_sample_write(dst, v, info->fmt, false);
@@ -188,7 +189,7 @@
 			info->bass.o1[i] = v;
 
 			pcm_sample_write(dst, v, info->fmt, true);
-			dst += AFMT_BPS(info->fmt);
+			dst += bps;
 			i++;
 		} while (--j != 0);
 	} while (--count != 0);