diff --git a/boxes/ubuntu/finalize b/boxes/ubuntu/finalize
index f818b36..8b6e273 100755
--- a/boxes/ubuntu/finalize
+++ b/boxes/ubuntu/finalize
@@ -148,12 +148,18 @@ write_sourceslist()
 deb [arch=$2] $MIRROR ${release} main restricted universe multiverse
 deb [arch=$2] $MIRROR ${release}-updates main restricted universe multiverse
 deb [arch=$2] $SECURITY_MIRROR ${release}-security main restricted universe multiverse
+deb-src [arch=$2] $MIRROR ${release} main restricted universe multiverse
+deb-src [arch=$2] $MIRROR ${release}-updates main restricted universe multiverse
+deb-src [arch=$2] $SECURITY_MIRROR ${release}-security main restricted universe multiverse
 EOF
     else
         cat >> "$1/etc/apt/sources.list" << EOF
 deb $MIRROR ${release} main restricted universe multiverse
 deb $MIRROR ${release}-updates main restricted universe multiverse
 deb $SECURITY_MIRROR ${release}-security main restricted universe multiverse
+deb-src $MIRROR ${release} main restricted universe multiverse
+deb-src $MIRROR ${release}-updates main restricted universe multiverse
+deb-src $SECURITY_MIRROR ${release}-security main restricted universe multiverse
 EOF
     fi
 }