diff --git a/src/fm95.c b/src/fm95.c
index 16eed34..d54fec1 100644
--- a/src/fm95.c
+++ b/src/fm95.c
@@ -364,7 +364,7 @@ int main(int argc, char **argv) {
 	lpf_l = iirfilt_rrrf_create_prototype(LIQUID_IIRDES_CHEBY2, LIQUID_IIRDES_LOWPASS, LIQUID_IIRDES_SOS, LPF_ORDER, (15000.0f/sample_rate), 0.0f, 1.0f, 40.0f);
 	lpf_r = iirfilt_rrrf_create_prototype(LIQUID_IIRDES_CHEBY2, LIQUID_IIRDES_LOWPASS, LIQUID_IIRDES_SOS, LPF_ORDER, (15000.0f/sample_rate), 0.0f, 1.0f, 40.0f);
 
-	iirfilt_rrrf mpx_lpf = iirfilt_rrrf_create_prototype(LIQUID_IIRDES_BUTTER, LIQUID_IIRDES_LOWPASS, LIQUID_IIRDES_SOS, 2, (polar_stereo ? (46250/sample_rate) : (53000/sample_rate)), 0.0f, 1.0f, 1.0f);
+	iirfilt_rrrf mpx_lpf = iirfilt_rrrf_create_prototype(LIQUID_IIRDES_BUTTER, LIQUID_IIRDES_LOWPASS, LIQUID_IIRDES_SOS, 2, (polar_stereo ? (46250.0f/sample_rate) : (53000.0f/sample_rate)), 0.0f, 1.0f, 1.0f);
 
 	ResistorCapacitor preemp_l, preemp_r;
 	init_preemphasis(&preemp_l, preemphasis_tau, sample_rate);