diff --git a/mirror-nixos-branch.pl b/mirror-nixos-branch.pl
index bac4cb7..f0b4517 100755
--- a/mirror-nixos-branch.pl
+++ b/mirror-nixos-branch.pl
@@ -108,6 +108,7 @@ sub fetch {
 my $rev = $evalInfo->{jobsetevalinputs}->{nixpkgs}->{revision} or die;
 
 # Get commit date of $rev as unixtime and formatted string
+run("git fetch origin $rev >&2") or die;
 my $revUnix = `git show --no-patch --format='%ct' $rev` or die;
 my $revDate = strftime("%F %T %Z", localtime($revUnix));