diff --git a/hw/xen/xen_pt_msi.c b/hw/xen/xen_pt_msi.c
index ff9a79f5d2..dfb8d64654 100644
--- a/hw/xen/xen_pt_msi.c
+++ b/hw/xen/xen_pt_msi.c
@@ -451,8 +451,12 @@ static void pci_msix_write(void *opaque, hwaddr addr,
         }
 
         entry->updated = true;
-    } else if (msix->enabled && entry->updated &&
-               !(val & PCI_MSIX_ENTRY_CTRL_MASKBIT)) {
+    } else if (entry->updated && !(val & PCI_MSIX_ENTRY_CTRL_MASKBIT)) {
+        /*
+         * NB: always register the entries with Xen when the write to the MSIX
+         * table happens, or else Xen won't be able to correctly snoop the
+         * entry control register write, and will fails to unmask the vector.
+         */
         const volatile uint32_t *vec_ctrl;
 
         /*
-- 
2.11.0 (Apple Git-81)