diff --git a/module_usb_audio/uac_hwresources.h b/module_usb_audio/uac_hwresources.h
index a5f67f6e..31181e19 100644
--- a/module_usb_audio/uac_hwresources.h
+++ b/module_usb_audio/uac_hwresources.h
@@ -27,8 +27,6 @@
 #define CLKBLK_USB_RST     XS1_CLKBLK_4 /* Clock block passed into L/G series XUD */
 #define CLKBLK_FLASHLIB    XS1_CLKBLK_5 /* Clock block for use by flash lib */
 
-/* #define CLKBLK_SPDIF_TX    XS1_CLKBLK_1 */
-/* #define CLKBLK_MCLK        XS1_CLKBLK_2 */
 #define CLKBLK_I2S_BIT     XS1_CLKBLK_3
 
 #else
@@ -44,11 +42,8 @@
 /* use REF for ADAT_RX on U-series */
 /* #define CLKBLK_ADAT_RX     XS1_CLKBLK_3 */
 /* Note, U-series XUD uses clock blocks 4 and 5 - see XUD_Ports.xc */
-
 #define CLKBLK_FLASHLIB    XS1_CLKBLK_5 /* Clock block for use by flash lib */
 
-/* #define CLKBLK_SPDIF_TX    XS1_CLKBLK_1 */
-/* #define CLKBLK_MCLK        XS1_CLKBLK_2 */
 #define CLKBLK_I2S_BIT     XS1_CLKBLK_3
 #endif