diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 24509e406dfe7e2c0795e1a86efbccdf343c16da..c436982247be366871cdfdff5aef4fbb7679ac02 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -3,6 +3,7 @@ image: stretch_website
 before_script:
   - export LANG=en_US.UTF-8
   - echo "deb http://security.debian.org/debian-security stretch/updates main contrib non-free" >> /etc/apt/sources.list
+  - echo "deb-src http://security.debian.org/debian-security stretch/updates main contrib non-free" >> /etc/apt/sources.list
   - sort /etc/apt/sources.list | uniq > sources.list.new
   - mv sources.list.new /etc/apt/sources.list
   - cat /etc/apt/sources.list
diff --git a/scripts/build.py b/scripts/build.py
index eb5e5ed0fc98eb6dfc2bf8100c949c49528cf7ff..128fcd598e97fbe47424e932966f35fe262a7932 100755
--- a/scripts/build.py
+++ b/scripts/build.py
@@ -113,10 +113,7 @@ def build_package(repo_dir, package_dir, name,
             for filename in os.listdir(tempdir)
             if filename.endswith(".deb")
         ]
-        print("deb packages:", deb_packages)
-        for filename in os.listdir(tempdir):
-            if not filename.endswith(".deb"):
-                continue
+        for filename in deb_packages:
             shutil.move(os.path.join(tempdir, filename), package_dir)
 
 
@@ -139,7 +136,8 @@ def main():
         build_package(repo_dir=repo_dir, package_dir=package_dir, **package)
         os.chdir(repo_dir)
 
-    print(os.listdir(package_dir))
+    import pprint
+    pprint.pprint(sorted(os.listdir(package_dir)))
 
 if __name__ == "__main__":
     main()