diff --git a/aucat/aucat.c b/aucat/aucat.c
index d1ac25b..4a866ab 100644
--- a/aucat/aucat.c
+++ b/aucat/aucat.c
@@ -311,7 +311,7 @@ slot_init(struct slot *s)
 			    xmalloc(s->round * slot_nch * sizeof(adata_t));
 		}
 		if (s->afile.rate != dev_rate) {
-			resamp_init(&s->resamp, s->round, dev_round,
+			resamp_init(&s->resamp, s->afile.rate, dev_rate,
 			    slot_nch);
 			s->resampbuf =
 			    xmalloc(dev_round * slot_nch * sizeof(adata_t));
@@ -330,7 +330,7 @@ slot_init(struct slot *s)
 		    s->cmin, s->cmax,
 		    s->cmin, s->cmax);
 		if (s->afile.rate != dev_rate) {
-			resamp_init(&s->resamp, dev_round, s->round,
+			resamp_init(&s->resamp, dev_rate, s->afile.rate,
 			    slot_nch);
 			s->resampbuf =
 			    xmalloc(dev_round * slot_nch * sizeof(adata_t));
diff --git a/aucat/dsp.c b/aucat/dsp.c
index a1479d5..b525632 100644
--- a/aucat/dsp.c
+++ b/aucat/dsp.c
@@ -405,6 +405,19 @@ resamp_do(struct resamp *p, adata_t *in, adata_t *out, int icnt, int ocnt)
 #endif
 }
 
+static unsigned int
+uint_gcd(unsigned int a, unsigned int b)
+{
+	unsigned int r;
+
+	while (b > 0) {
+		r = a % b;
+		a = b;
+		b = r;
+	}
+	return a;
+}
+
 /*
  * initialize resampler with ibufsz/obufsz factor and "nch" channels
  */
@@ -412,7 +425,22 @@ void
 resamp_init(struct resamp *p, unsigned int iblksz,
     unsigned int oblksz, int nch)
 {
-	unsigned int i;
+	unsigned int i, g;
+
+	/*
+	 * reduice iblksz/oblksz fraction
+	 */
+	g = uint_gcd(iblksz, oblksz);
+	iblksz /= g;
+	oblksz /= g;
+
+	/*
+	 * ensure weired rates dont cause integer overflows
+	 */
+	while (iblksz > ADATA_UNIT || oblksz > ADATA_UNIT) {
+		iblksz >>= 1;
+		oblksz >>= 1;
+	}
 
 	p->iblksz = iblksz;
 	p->oblksz = oblksz;