Index: uspace/lib/usbvirt/Makefile
===================================================================
--- uspace/lib/usbvirt/Makefile	(revision 7a7bfeb30fdd348b34bb92383e98a63c4fff1346)
+++ uspace/lib/usbvirt/Makefile	(revision fa2a3611e963c611a00be931fc762129e542bea4)
@@ -34,4 +34,5 @@
 
 SOURCES = \
+	callback.c \
 	ctrlpipe.c \
 	main.c \