diff --git a/include/linux/usb.h b/include/linux/usb.h
index c8e55aa..8bc81bf 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -336,7 +336,7 @@
 #endif
 	struct device *dev;		/* device for this bus */
 
-#if defined(CONFIG_USB_MON)
+#if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE)
 	struct mon_bus *mon_bus;	/* non-null when associated */
 	int monitored;			/* non-zero when monitored */
 #endif