diff --git a/sys/dev/bhnd/bhndb/bhndb_pcivar.h b/sys/dev/bhnd/bhndb/bhndb_pcivar.h
index ed749518..7b473fa6 100644
--- a/sys/dev/bhnd/bhndb/bhndb_pcivar.h
+++ b/sys/dev/bhnd/bhndb/bhndb_pcivar.h
@@ -70,6 +70,14 @@ enum {
 	 * interrupt flags via the SIBA_CFG0_INTVEC register.
 	 */
 	BHNDB_PCI_QUIRK_SIBA_INTVEC	= (1<<1),
+
+	/**
+	 * The PCI/PCIe bridge must not use MSI; instead, fall back to legacy
+	 * INTx line interrupts. Required on some systems (e.g. NVIDIA MCP89
+	 * based Apple MacBook Air) where MSI messages from the Broadcom
+	 * PCIe-G1 endpoint are never delivered, causing device timeouts.
+	 */
+	BHNDB_PCI_QUIRK_NO_MSI		= (1<<2),
 };
 
 /** bhndb_pci quirk table entry */