diff --git a/src/vmm_mad/remotes/lib/lxd/mapper/qcow2.rb b/src/vmm_mad/remotes/lib/lxd/mapper/qcow2.rb
index 9c9c59f09b..9182b84b91 100644
--- a/src/vmm_mad/remotes/lib/lxd/mapper/qcow2.rb
+++ b/src/vmm_mad/remotes/lib/lxd/mapper/qcow2.rb
@@ -35,13 +35,10 @@ class Qcow2Mapper < Mapper
         dsrc = one_vm.disk_source(disk)
         File.chmod(0o664, dsrc) if File.symlink?(one_vm.sysds_path)
 
-        map = (COMMANDS[:nbd]).to_s
-
+        map = "#{COMMANDS[:nbd]} -c #{device} #{dsrc}"
         map << " --cache=#{disk['CACHE']}" if
             CACHE_MODES.include?(disk['CACHE'])
-
         map << ' --fork' if fork_supported
-        map << " -c #{device} #{dsrc}"
 
         rc, _out, err = Command.execute(map, true)