diff --git a/hw/msix.c b/hw/msix.c
index 63b41b9933..29696016ad 100644
--- a/hw/msix.c
+++ b/hw/msix.c
@@ -176,6 +176,12 @@ static void msix_mmio_write(void *opaque, target_phys_addr_t addr,
     PCIDevice *dev = opaque;
     unsigned int offset = addr & (MSIX_PAGE_SIZE - 1) & ~0x3;
     int vector = offset / PCI_MSIX_ENTRY_SIZE;
+
+    /* MSI-X page includes a read-only PBA and a writeable Vector Control. */
+    if (vector >= dev->msix_entries_nr) {
+        return;
+    }
+
     pci_set_long(dev->msix_table_page + offset, val);
     msix_handle_mask_update(dev, vector);
 }