diff --git a/www/manager6/qemu/ProcessorEdit.js b/www/manager6/qemu/ProcessorEdit.js
index 3ecea205..4c0524eb 100644
--- a/www/manager6/qemu/ProcessorEdit.js
+++ b/www/manager6/qemu/ProcessorEdit.js
@@ -124,6 +124,7 @@ Ext.define('PVE.qemu.ProcessorInputPanel', {
 	    xtype: 'proxmoxintegerfield',
 	    name: 'vcpus',
 	    minValue: 1,
+	    maxValue: 1,
 	    value: '',
 	    fieldLabel: gettext('VCPUs'),
 	    deleteEmpty: true,