diff --git a/src/dsd_filters.c b/src/dsd_filters.c
index c78fc6f..ee3095b 100644
--- a/src/dsd_filters.c
+++ b/src/dsd_filters.c
@@ -175,7 +175,7 @@ dmr_filter(short sample)
 short
 nxdn_filter(short sample)
 {
-    return dsd_input_filter(sample, 2); 
+    return dsd_input_filter(sample, 4);
 }
 
 short