diff --git a/arch/x86/lib/thunk_64.S b/arch/x86/lib/thunk_64.S
index 55e586d..6ea73f3 100644
--- a/arch/x86/lib/thunk_64.S
+++ b/arch/x86/lib/thunk_64.S
@@ -50,6 +50,10 @@
 	thunk trace_hardirqs_on_thunk,trace_hardirqs_on
 	thunk trace_hardirqs_off_thunk,trace_hardirqs_off
 #endif
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+	thunk lockdep_sys_exit_thunk,lockdep_sys_exit
+#endif
 	
 	/* SAVE_ARGS below is used only for the .cfi directives it contains. */
 	CFI_STARTPROC