diff --git a/module_usb_audio/pdm_mics/pcm_pdm_mic.xc b/module_usb_audio/pdm_mics/pcm_pdm_mic.xc
index 1e5295e1..efb35649 100644
--- a/module_usb_audio/pdm_mics/pcm_pdm_mic.xc
+++ b/module_usb_audio/pdm_mics/pcm_pdm_mic.xc
@@ -103,8 +103,8 @@ void pcm_pdm_mic(chanend c_pcm_out)
     par
     {
         mic_array_pdm_rx(p_pdm_mics, c_4x_pdm_mic_0, c_4x_pdm_mic_1);
-        mic_array_decimate_to_pcm_4ch(c_4x_pdm_mic_0, c_ds_output[0]);
-        mic_array_decimate_to_pcm_4ch(c_4x_pdm_mic_1, c_ds_output[1]);
+        mic_array_decimate_to_pcm_4ch(c_4x_pdm_mic_0, c_ds_output[0], MIC_ARRAY_NO_INTERNAL_CHANS);
+        mic_array_decimate_to_pcm_4ch(c_4x_pdm_mic_1, c_ds_output[1], MIC_ARRAY_NO_INTERNAL_CHANS);
         pdm_process(c_ds_output, c_pcm_out);
     }
 }