diff --git a/scripts/mkvm.ps1 b/scripts/mkvm.ps1
index 2616280..dc214fb 100644
--- a/scripts/mkvm.ps1
+++ b/scripts/mkvm.ps1
@@ -30,7 +30,7 @@ $vmCpus = @{
 
 function create_vm{ param([string]$nomvm)
 
-	if ($vmMem.ContainsKey($nomvm)) -and ($vmCpus.ContainsKey($nomvm))) {
+	if (($vmMem.ContainsKey($nomvm)) -and ($vmCpus.ContainsKey($nomvm))) {
 	    & "$vboxmanage" import "$ovafile"  --vsys 0 --vmname "$nomvm" --memory $vmMem[$nomvm] --cpus $vmCpus[$nomvm]
             Write-Host "Machine $nomvm importée"
         } else {