diff --git a/tools/python/xen/xend/server/irqif.py b/tools/python/xen/xend/server/irqif.py
index 346ad7cf4d..7e96726834 100644
--- a/tools/python/xen/xend/server/irqif.py
+++ b/tools/python/xen/xend/server/irqif.py
@@ -61,7 +61,7 @@ class IRQController(DevController):
        
         pirq = get_param('irq')
 
-        rc = xc.domain_irq_permission(dom          = self.getDomid(),
+        rc = xc.domain_irq_permission(domid        = self.getDomid(),
                                       pirq         = pirq,
                                       allow_access = True)