diff --git a/lib/filters.h b/lib/filters.h
index e4e15f5..12c4281 100644
--- a/lib/filters.h
+++ b/lib/filters.h
@@ -5,7 +5,7 @@
 #include "constants.h"
 #include "oscillator.h"
 
-#define FIR_ORDER 21
+#define FIR_ORDER 13
 
 typedef struct
 {
diff --git a/src/fm95.c b/src/fm95.c
index d86d02c..00c4512 100644
--- a/src/fm95.c
+++ b/src/fm95.c
@@ -415,8 +415,8 @@ int main(int argc, char **argv) {
 	init_preemphasis(&preemp_r, preemphasis_tau, sample_rate);
 
 	FIR lpf_l, lpf_r;
-	init_lpf(&lpf_l, 15000/sample_rate, sample_rate);
-	init_lpf(&lpf_r, 15000/sample_rate, sample_rate);
+	init_lpf(&lpf_l, 15000, sample_rate);
+	init_lpf(&lpf_r, 15000, sample_rate);
 
 	signal(SIGINT, stop);
 	signal(SIGTERM, stop);