diff --git a/files/sources.list/ubuntu.sources b/files/sources.list/ubuntu.sources
index 0313480..d1cf94e 100644
--- a/files/sources.list/ubuntu.sources
+++ b/files/sources.list/ubuntu.sources
@@ -1,4 +1,4 @@
-Types: deb
+Types: deb deb-src
 URIs: https://mirrors.tuna.tsinghua.edu.cn/ubuntu/
 Suites: __CODENAME__ __CODENAME__-updates __CODENAME__-backports __CODENAME__-security
 Components: main restricted universe multiverse