diff --git a/tools/publish-auto-update.pl b/tools/publish-auto-update.pl
index 3493f964..0c7a47d6 100755
--- a/tools/publish-auto-update.pl
+++ b/tools/publish-auto-update.pl
@@ -57,9 +57,10 @@ $timestamp *= 1000; # Convert to milliseconds
 
 # locate sha256 utility
 my $SHA256 = `which sha256sum || which sha256`;
+chomp $SHA256;
 
 # SHA256 of actual update file
-my $sha256 = `git show auto-update-${commit_hash}:${project}.update | ${SHA256}`;
+my $sha256 = `git show auto-update-${commit_hash}:${project}.update | ${SHA256} | head -c 64`;
 die("Can't calculate SHA256 of ${project}.update\n") unless $sha256 =~ m/(\S{64})/;
 chomp $sha256;