diff --git a/module_usb_audio/clocking/clockgen.xc b/module_usb_audio/clocking/clockgen.xc
index 41234b48..d2b430eb 100644
--- a/module_usb_audio/clocking/clockgen.xc
+++ b/module_usb_audio/clocking/clockgen.xc
@@ -200,7 +200,7 @@ extern int samples_to_host_inputs_buff[NUM_USB_CHAN_IN];        /* Audio transmi
 int VendorAudCoreReqs(unsigned cmd, chanend c);
 
 #pragma unsafe arrays
-void clockGen (streaming chanend c_spdif_rx, chanend c_adat_rx, out port p, chanend c_dig_rx, chanend c_clk_ctl, chanend c_clk_int)
+void clockGen (streaming chanend c_spdif_rx, chanend ?c_adat_rx, out port p, chanend c_dig_rx, chanend c_clk_ctl, chanend c_clk_int)
 {
     timer t_local;
     unsigned timeNextEdge, timeLastEdge, timeNextClockDetection;
@@ -256,7 +256,6 @@ void clockGen (streaming chanend c_spdif_rx, chanend c_adat_rx, out port p, chan
        g_digData[i] = 0;
     }
 
-
     /* Init clock unit state */
 #ifdef SPDIF_RX
     clockFreq[CLOCK_SPDIF_INDEX] = 0;