diff --git a/elbepack/cdroms.py b/elbepack/cdroms.py
index 2ac129310..00ca5f471 100644
--- a/elbepack/cdroms.py
+++ b/elbepack/cdroms.py
@@ -22,6 +22,7 @@
 
 def add_source_pkg(repo, component, cache, pkg, version, forbid):
     if pkg in forbid:
+        logging.info("Ignoring source package %s", pkg)
         return
     pkg_id = f'{pkg}-{version}'
     try:
@@ -56,6 +57,12 @@ def mk_source_cdrom(components, codename,
     for component in components.keys():
         rfs, cache, pkg_lst = components[component]
         logging.info('Adding %s component', component)
+
+        forbiddenSrcPackages = []
+        for name, _ in cache.get_corresponding_source_packages(forbiddenPackages):
+            if name not in forbiddenSrcPackages:
+                forbiddenSrcPackages.append(name)
+
         rfs.mkdir_p('/var/cache/elbe/sources')
         repo = CdromSrcRepo(codename, init_codename,
                             os.path.join(target, f'srcrepo-{component}'),
@@ -64,14 +71,14 @@ def mk_source_cdrom(components, codename,
         for pkg, version in pkg_lst:
             add_source_pkg(repo, component,
                            cache, pkg, version,
-                           forbiddenPackages)
+                           forbiddenSrcPackages)
 
         if component == 'main' and xml is not None:
             for p in xml.node('debootstrappkgs'):
                 pkg = XMLPackage(p)
                 srcpkgs = cache.get_corresponding_source_packages([pkg])
                 for srcpkg, srcpkg_ver in srcpkgs:
-                    add_source_pkg(repo, component, cache, srcpkg, srcpkg_ver, forbiddenPackages)
+                    add_source_pkg(repo, component, cache, srcpkg, srcpkg_ver, forbiddenSrcPackages)
 
     # elbe fetch_initvm_pkgs has downloaded all sources to
     # /var/cache/elbe/sources