diff --git a/mirror-nixos-branch.pl b/mirror-nixos-branch.pl
index d1986f4..396b85d 100755
--- a/mirror-nixos-branch.pl
+++ b/mirror-nixos-branch.pl
@@ -115,7 +115,7 @@ if ($bucket->head_key("$releasePrefix")) {
         }
 
         if (-e "$dstFile.sha256") {
-            my $sha256_actual = `nix hash-file --type sha256 '$dstFile'`;
+            my $sha256_actual = `nix hash-file --base16 --type sha256 '$dstFile'`;
             chomp $sha256_actual;
             if ($sha256_expected ne $sha256_actual) {
                 print STDERR "file $dstFile is corrupt $sha256_expected $sha256_actual\n";