diff --git a/include/kvm/vfio.h b/include/kvm/vfio.h
index 60e6c54..28223cf 100644
--- a/include/kvm/vfio.h
+++ b/include/kvm/vfio.h
@@ -74,6 +74,7 @@
 
 	unsigned long			irq_modes;
 	int				intx_fd;
+	int				unmask_fd;
 	unsigned int			intx_gsi;
 	struct vfio_pci_msi_common	msi;
 	struct vfio_pci_msi_common	msix;
diff --git a/vfio/pci.c b/vfio/pci.c
index 03de3c1..5224fee 100644
--- a/vfio/pci.c
+++ b/vfio/pci.c
@@ -1008,6 +1008,7 @@
 	irq__del_irqfd(kvm, gsi, pdev->intx_fd);
 
 	close(pdev->intx_fd);
+	close(pdev->unmask_fd);
 }
 
 static int vfio_pci_enable_intx(struct kvm *kvm, struct vfio_device *vdev)
@@ -1095,6 +1096,7 @@
 	}
 
 	pdev->intx_fd = trigger_fd;
+	pdev->unmask_fd = unmask_fd;
 	/* Guest is going to ovewrite our irq_line... */
 	pdev->intx_gsi = gsi;