diff --git a/src/fm95.c b/src/fm95.c
index 54645a0..10880cb 100644
--- a/src/fm95.c
+++ b/src/fm95.c
@@ -361,8 +361,8 @@ int main(int argc, char **argv) {
 	init_fm_modulator(&sca_mod, sca_frequency, sca_deviation, sample_rate);
 
 	iirfilt_crcf lpf_l, lpf_r;
-	lpf_l = iirfilt_crcf_create_prototype(LIQUID_IIRDES_CHEBY2, LIQUID_IIRDES_LOWPASS, LIQUID_IIRDES_SOS, LPF_ORDER, (15000.0f/sample_rate), 0.0f, 1.0f, 60.0f);
-	lpf_r = iirfilt_crcf_create_prototype(LIQUID_IIRDES_CHEBY2, LIQUID_IIRDES_LOWPASS, LIQUID_IIRDES_SOS, LPF_ORDER, (15000.0f/sample_rate), 0.0f, 1.0f, 60.0f);
+	lpf_l = iirfilt_crcf_create_prototype(LIQUID_IIRDES_BUTTER, LIQUID_IIRDES_LOWPASS, LIQUID_IIRDES_SOS, LPF_ORDER, (15000.0f/sample_rate), 0.0f, 1.0f, 1.0f);
+	lpf_r = iirfilt_crcf_create_prototype(LIQUID_IIRDES_BUTTER, LIQUID_IIRDES_LOWPASS, LIQUID_IIRDES_SOS, LPF_ORDER, (15000.0f/sample_rate), 0.0f, 1.0f, 1.0f);
 
 	ResistorCapacitor preemp_l, preemp_r;
 	init_preemphasis(&preemp_l, preemphasis_tau, sample_rate);