Index: uspace/lib/c/arch/ia64/include/ddi.h
===================================================================
--- uspace/lib/c/arch/ia64/include/ddi.h	(revision 00aece0f4f90a094c54cb53169457a54b87db366)
+++ uspace/lib/c/arch/ia64/include/ddi.h	(revision 26f407e90719dc76ce1f86801063927e18df356f)
@@ -134,5 +134,5 @@
 	asm volatile ("mf\n" ::: "memory");
 
-	if (port < (ioport32_t *) port) {
+	if (port < (ioport32_t *) IO_SPACE_BOUNDARY) {
 		uintptr_t prt = (uintptr_t) port;