diff --git a/sys/ia64/include/bus.h b/sys/ia64/include/bus.h
index 981445fc2fbd..a2a02a09f5a8 100644
--- a/sys/ia64/include/bus.h
+++ b/sys/ia64/include/bus.h
@@ -126,7 +126,7 @@
 #define BUS_SPACE_MAXSIZE	0xFFFFFFFFFFFFFFFF
 #define BUS_SPACE_MAXADDR_24BIT	0xFFFFFF
 #define BUS_SPACE_MAXADDR_32BIT 0xFFFFFFFF
-#define BUS_SPACE_MAXADDR	0xFFFFFFFF
+#define BUS_SPACE_MAXADDR	0xFFFFFFFFFFFFFFFF
 
 #define BUS_SPACE_UNRESTRICTED	(~0)