diff --git a/Makefile b/Makefile
index 4fc6a82..8a04727 100644
--- a/Makefile
+++ b/Makefile
@@ -313,6 +313,7 @@
 endif
 LIBS-y += drivers/rtc/librtc.o
 LIBS-y += drivers/serial/libserial.o
+LIBS-y += drivers/sound/libsound.o
 LIBS-$(CONFIG_GENERIC_LPC_TPM) += drivers/tpm/libtpm.o
 LIBS-y += drivers/twserial/libtws.o
 LIBS-y += drivers/usb/eth/libusb_eth.o