diff --git a/arch/m68k/include/asm/io_no.h b/arch/m68k/include/asm/io_no.h
index 6adef1e..7f57436 100644
--- a/arch/m68k/include/asm/io_no.h
+++ b/arch/m68k/include/asm/io_no.h
@@ -134,7 +134,7 @@
 #define insw(a,b,l) io_insw(a,b,l)
 #define insl(a,b,l) io_insl(a,b,l)
 
-#define IO_SPACE_LIMIT 0xffff
+#define IO_SPACE_LIMIT 0xffffffff
 
 
 /* Values for nocacheflag and cmode */