diff --git a/include/linux/usb/audio.h b/include/linux/usb/audio.h
index a54b825..c3ea237 100644
--- a/include/linux/usb/audio.h
+++ b/include/linux/usb/audio.h
@@ -175,6 +175,7 @@
 	__u8  baInterfaceNr[n];					\
 } __attribute__ ((packed))
 
+DECLARE_UAC_AC_HEADER_DESCRIPTOR(2);
 /* 4.3.2.1 Input Terminal Descriptor */
 struct uac_input_terminal_descriptor {
 	__u8  bLength;			/* in bytes: 12 */
@@ -454,6 +455,7 @@
 	__u8  tSamFreq[n][3];					\
 } __attribute__ ((packed))
 
+DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1);
 #define UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(n)	(8 + (n * 3))
 
 struct uac_format_type_i_ext_descriptor {