--- a/src/effects_i_dsp.c
+++ b/src/effects_i_dsp.c
@@ -357,7 +357,7 @@
     double scale, sox_bool dc_norm)
 {
   int i, m = num_taps - 1;
-  double * h = malloc(num_taps * sizeof(*h)), sum = 0;
+  double * h = calloc(num_taps, sizeof(*h)), sum = 0;
   double mult = scale / lsx_bessel_I_0(beta), mult1 = 1 / (.5 * m + rho);
   assert(Fc >= 0 && Fc <= 1);
   lsx_debug("make_lpf(n=%i Fc=%.7g β=%g ρ=%g dc-norm=%i scale=%g)", num_taps, Fc, beta, rho, dc_norm, scale);