diff --git a/sys/modules/sound/driver/Makefile b/sys/modules/sound/driver/Makefile
index e4425e5a53c..36f725e5d3c 100644
--- a/sys/modules/sound/driver/Makefile
+++ b/sys/modules/sound/driver/Makefile
@@ -1,7 +1,7 @@
 # $FreeBSD$
 
 SUBDIR = ad1816 csa csapcm ds1 emu10k1 es137x es1888 ess gusc
-SUBDIR += mss neomagic sb sbc t4dwave
+SUBDIR += mss neomagic sb sbc solo t4dwave
 SUBDIR += driver
 
 .include <bsd.subdir.mk>