diff --git a/arch/powerpc/include/asm/pnv-pci.h b/arch/powerpc/include/asm/pnv-pci.h
index 17e89dd613e190246db5d31212723de041a5a9e0..74b0b1e311b591555dba0effba8102ee3eb5514d 100644
--- a/arch/powerpc/include/asm/pnv-pci.h
+++ b/arch/powerpc/include/asm/pnv-pci.h
@@ -15,7 +15,7 @@
 #include <misc/cxl-base.h>
 #include <asm/opal-api.h>
 
-#define PCI_SLOT_ID_PREFIX	0x8000000000000000
+#define PCI_SLOT_ID_PREFIX	(1UL << 63)
 #define PCI_SLOT_ID(phb_id, bdfn)	\
 	(PCI_SLOT_ID_PREFIX | ((uint64_t)(bdfn) << 16) | (phb_id))