diff --git a/nbdkit.spec b/nbdkit.spec
index 0ecfad2..b0a6385 100644
--- a/nbdkit.spec
+++ b/nbdkit.spec
@@ -394,8 +394,10 @@ Summary:        Tar archive plugin for %{name}
 License:        BSD
 
 Requires:       %{name}-server%{?_isa} = %{version}-%{release}
-# XXX This dependency should be autogenerated.
+# XXX These should be autogenerated.
 Requires:       %{name}-perl-plugin
+Requires:       perl(Cwd)
+Requires:       perl(IO::File)
 
 
 %description tar-plugin