diff --git a/lasp/lasp_avstream.py b/lasp/lasp_avstream.py
index a58c7d2..fa5bb7b 100644
--- a/lasp/lasp_avstream.py
+++ b/lasp/lasp_avstream.py
@@ -149,7 +149,7 @@ class AudioStream:
             if ch.highpass > 0:
                 fb = SosFilterBank(1, 1)
                 hpf = highpass(samplerate, ch.highpass, Q=np.sqrt(2))
-                fb.setFilter(0, hpf)
+                fb.setFilter(0, hpf[None, :])
                 self.hpfs[i] = fb
 
         self.streammetadata = StreamMetaData(