diff --git a/include/linux/pci.h b/include/linux/pci.h
index 15e1675edef920755272fee34494c5bc934911a2..3a6a4e37a482f3a6d4e54cc044c1c438d87eb999 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -97,7 +97,7 @@ enum pci_channel_state {
 
 typedef unsigned short __bitwise pci_bus_flags_t;
 enum pci_bus_flags {
-	PCI_BUS_FLAGS_NO_MSI = (pci_bus_flags_t) 1,
+	PCI_BUS_FLAGS_NO_MSI = (__force pci_bus_flags_t) 1,
 };
 
 struct pci_cap_saved_state {