detect_zeroes is a boolean

diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
index a62ab0421d5f537acc8e10f1ba4a219ed364c786..14a18f0cf7dc7c62d705148c47da60e7e68d5099 100644 (file)
--- a/PVE/QemuServer.pm
+++ b/PVE/QemuServer.pm
@@ -1338,7 +1338,7 @@ sub print_drive_full {
 
     if (!drive_is_cdrom($drive)) {
        my $detectzeroes;
-       if ($drive->{detect_zeroes} && $drive->{detect_zeroes} eq 'off') {
+       if (defined($drive->{detect_zeroes}) && !$drive->{detect_zeroes}) {
            $detectzeroes = 'off';
        } elsif ($drive->{discard}) {
            $detectzeroes = $drive->{discard} eq 'on' ? 'unmap' : 'on';