diff --git a/bsp/essemi/es8p508x/SConscript b/bsp/essemi/es8p508x/SConscript
index df4aa532bead4509e75228f6d271fba8b11d1b32..11d722608a44e2e6ea508de14d4618c41740ca16 100644
--- a/bsp/essemi/es8p508x/SConscript
+++ b/bsp/essemi/es8p508x/SConscript
@@ -1,8 +1,9 @@
 # RT-Thread SConscript bridge
 import os
+from building import *
 
 objs = []
-cwd  = GetCurrentDir()
+cwd = GetCurrentDir()
 list = os.listdir(cwd)
 
 for d in list: