diff --git a/libcpu/aarch64/SConscript b/libcpu/aarch64/SConscript
index 5dece501d9..957708fd99 100644
--- a/libcpu/aarch64/SConscript
+++ b/libcpu/aarch64/SConscript
@@ -1,6 +1,7 @@
 # RT-Thread building script for bridge
 
 import os
+import re
 from building import *
 
 Import('rtconfig')