diff --git a/CMakeLists.txt b/CMakeLists.txt
index cc473c4..f5ba86b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,7 +3,7 @@ cmake_minimum_required(VERSION 2.8)
 PROJECT(ubox C)
 ADD_DEFINITIONS(-Os -Wall -Werror --std=gnu99 -g3)
 
-SET(SOURCES avl.c blob.c blobmsg.c hash.c uhtbl.c uloop.c)
+SET(SOURCES avl.c blob.c blobmsg.c hash.c uhtbl.c uloop.c usock.c)
 
 ADD_LIBRARY(ubox SHARED ${SOURCES})