diff --git a/src/filter/plugins/HdcdFilterPlugin.cxx b/src/filter/plugins/HdcdFilterPlugin.cxx
index 03392614a..32fa08237 100644
--- a/src/filter/plugins/HdcdFilterPlugin.cxx
+++ b/src/filter/plugins/HdcdFilterPlugin.cxx
@@ -92,7 +92,7 @@ HdcdFilter::HdcdFilter(AudioFormat &audio_format)
 	out_audio_format.format = SampleFormat::S32;
 
 	in_audio_frame_size = audio_format.GetFrameSize();
-	out_audio_frame_size = audio_format.GetFrameSize();
+	out_audio_frame_size = out_audio_format.GetFrameSize();
 }
 
 class PreparedHdcdFilter final : public PreparedFilter {