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-rw-r--r--sysdeps/mach/hurd/i386/ioperm.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sysdeps/mach/hurd/i386/ioperm.c b/sysdeps/mach/hurd/i386/ioperm.c
index 39139bc565..be243d1ac9 100644
--- a/sysdeps/mach/hurd/i386/ioperm.c
+++ b/sysdeps/mach/hurd/i386/ioperm.c
@@ -36,7 +36,7 @@ ioperm (unsigned long int from, unsigned long int num, int turn_on)
   if (! err)
     {
       io_perm_t perm;
-      err = __i386_io_perm_create (devmaster, from, from + num, &perm);
+      err = __i386_io_perm_create (devmaster, from, from + num - 1, &perm);
       __mach_port_deallocate (__mach_task_self (), devmaster);
       if (! err)
 	{