diff --git a/filter/ysvf.h b/filter/ysvf.h
index 57df068..01bbd1f 100644
--- a/filter/ysvf.h
+++ b/filter/ysvf.h
@@ -16,7 +16,7 @@ enum filter_types {
 template <typename t_sample>
 class ysvf {
 public:
-    ysvf(double _samplerate)
+    ysvf(double _samplerate = 44100)
         : lowpass { _samplerate }
         , highpass { _samplerate }
         , bandpass { _samplerate }