diff --git a/linux/dummy.h b/linux/dummy.h
index cd6006bc..c65aee2f 100644
--- a/linux/dummy.h
+++ b/linux/dummy.h
@@ -33,12 +33,18 @@
 #define	sys_syslog		printargs
 #define	sys_iopl		printargs
 #define	sys_vm86old		printargs
-#define	sys_modify_ldt		printargs
 #define	sys_get_kernel_syms	printargs
 #define	sys_bdflush		printargs
 #define	sys_sysfs		printargs
 #define	sys_afs_syscall		printargs
 
+/* machine-specific */
+#ifndef I386
+#define	sys_modify_ldt		printargs
+#define sys_get_thread_area	printargs
+#define sys_set_thread_area	printargs
+#endif
+
 #define sys_sched_setparam	printargs
 #define sys_sched_getparam	printargs
 #define sys_sched_setscheduler	printargs