diff --git a/pkgs/build-support/kernel/paths-from-graph.pl b/pkgs/build-support/kernel/paths-from-graph.pl
index 43ce4e68db44..f18662372103 100644
--- a/pkgs/build-support/kernel/paths-from-graph.pl
+++ b/pkgs/build-support/kernel/paths-from-graph.pl
@@ -53,6 +53,7 @@ elsif ($ENV{"printRegistration"} eq "1") {
     foreach my $storePath (sort (keys %storePaths)) {
         print "$storePath\n";
         print "0000000000000000000000000000000000000000000000000000000000000000\n"; # !!! fix
+        print "0\n"; # !!! fix	
         print "\n"; # don't care about preserving the deriver
         print scalar(@{$refs{$storePath}}), "\n";
         foreach my $ref (@{$refs{$storePath}}) {