diff --git a/sound/usb/card.c b/sound/usb/card.c
index 0bd62a1..da1346b 100644
--- a/sound/usb/card.c
+++ b/sound/usb/card.c
@@ -606,6 +606,9 @@
 
 	return 0;
 }
+#else
+#define usb_audio_suspend	NULL
+#define usb_audio_resume	NULL
 #endif		/* CONFIG_PM */
 
 static struct usb_device_id usb_audio_ids [] = {