diff --git a/src/installer/OpenSLX/OSSetup/Engine.pm b/src/installer/OpenSLX/OSSetup/Engine.pm
index 1ad30ba..9b01a4d 100644
--- a/src/installer/OpenSLX/OSSetup/Engine.pm
+++ b/src/installer/OpenSLX/OSSetup/Engine.pm
@@ -1799,7 +1799,7 @@ sub _clone_fetchSource
     vlog(1, "using exclude-include-filter:\n$excludeIncludeList\n");
     my $additionalRsyncOptions = $ENV{SLX_RSYNC_OPTIONS} || '';
     my $rsyncCmd 
-        = "rsync -av --numeric-ids --delete --exclude-from=- $additionalRsyncOptions"
+        = "rsync --rsh='ssh -c arcfour' -av --numeric-ids --delete --exclude-from=- $additionalRsyncOptions"
             . " $source $self->{'vendor-os-path'}";
     vlog(2, "executing: $rsyncCmd\n");
     my $rsyncFH;