Index: sysdeps/openbsd/procio.c
--- sysdeps/openbsd/procio.c.orig
+++ sysdeps/openbsd/procio.c
@@ -50,7 +50,7 @@ glibtop_get_proc_io_p (glibtop *server, glibtop_proc_i
 	glibtop_suid_enter (server);
 
 	/* Get the process information */
-	pinfo = kvm_getprocs (server->machine->kd, KERN_PROC_PID, pid, &count);
+	pinfo = kvm_getprocs (server->machine->kd, KERN_PROC_PID, pid, sizeof(*pinfo), &count);
 	if ((pinfo == NULL) || (count != 1)) {
 		glibtop_warn_io_r (server, "kvm_getprocs (%d)", pid);
 		glibtop_suid_leave (server);
@@ -74,7 +74,7 @@ glibtop_get_proc_io_p (glibtop *server, glibtop_proc_i
 
 	   FIXME: seems the blocksize is 1024 but ...
 	*/
-	buf->disk_rbytes = pinfo->ki_rusage.ru_inblock << 10;
-	buf->disk_wbytes = pinfo->ki_rusage.ru_oublock << 10;
+	buf->disk_rbytes = pinfo->p_uru_inblock << 10;
+	buf->disk_wbytes = pinfo->p_uru_oublock << 10;
 	buf->flags = _glibtop_sysdeps_proc_io;
 }