diff --git a/lib/ZnapZend/Config.pm b/lib/ZnapZend/Config.pm
index d17a4921..37c3c9d0 100644
--- a/lib/ZnapZend/Config.pm
+++ b/lib/ZnapZend/Config.pm
@@ -182,6 +182,10 @@ my $checkBackupSets = sub {
                 $backupSet->{src_mbuffer} = undef;
             }
         }
+        if (!($backupSet->{src_mbuffer})) {
+            # Do not leave loose ends after all
+            $backupSet->{src_mbuffer} = 'off';
+        }
         if (!exists($backupSet->{src_mbuffer_size}) or !($backupSet->{src_mbuffer_size})) {
             $backupSet->{src_mbuffer_size} = $backupSet->{mbuffer_size};
             $self->zLog->info("WARNING: property 'src_mbuffer_size' not set on backup for " . $backupSet->{src} . ", inheriting from legacy 'mbuffer_size': " . $backupSet->{src_mbuffer_size}) if $backupSet->{src_mbuffer_size};