diff --git a/sdrbase/dsp/upchannelizer.h b/sdrbase/dsp/upchannelizer.h
index d609a29a6..b890ab2e4 100644
--- a/sdrbase/dsp/upchannelizer.h
+++ b/sdrbase/dsp/upchannelizer.h
@@ -25,7 +25,7 @@
 #include "util/message.h"
 #include "dsp/inthalfbandfilter.h"
 
-#define UPCHANNELIZER_HB_FILTER_ORDER 80
+#define UPCHANNELIZER_HB_FILTER_ORDER 64
 
 class MessageQueue;