diff --git a/src/lib/Hydra/Controller/Build.pm b/src/lib/Hydra/Controller/Build.pm
index 6c7521a3..d58b9664 100644
--- a/src/lib/Hydra/Controller/Build.pm
+++ b/src/lib/Hydra/Controller/Build.pm
@@ -362,7 +362,7 @@ sub restart : Chained('build') PathPart Args(0) {
     error($c, "This build cannot be restarted.")
         unless $build->finished && -f $drvpath ;
 
-    restartBuild($build);
+    restartBuild($c->model('DB')->schema, $build);
 
     $c->flash->{buildMsg} = "Build has been restarted.";
     
diff --git a/src/lib/Hydra/Helper/AddBuilds.pm b/src/lib/Hydra/Helper/AddBuilds.pm
index 791ae17f..e293d9b3 100644
--- a/src/lib/Hydra/Helper/AddBuilds.pm
+++ b/src/lib/Hydra/Helper/AddBuilds.pm
@@ -776,6 +776,7 @@ sub restartBuild {
         my $paths = "";
         foreach my $bs ($build->buildsteps) {
           $paths = $paths . " " . $bs->outpath;
+          print STDERR $paths . "\n";
         }
 
         my $r = `nix-store --clear-failed-paths $paths $outpath`;