diff --git a/tools/building.py b/tools/building.py
index 9bf390cba2..9f54a6ceac 100644
--- a/tools/building.py
+++ b/tools/building.py
@@ -115,15 +115,15 @@ def PrepareBuilding(env, root_directory, has_libcpu=False):
     #env['LINKCOMSTR'] = "Link $TARGET"
 
     # board build script
-    objs = SConscript('SConscript', variant_dir='build/bsp', duplicate=0)
+    objs = SConscript('SConscript', variant_dir='build', duplicate=0)
     Repository(Rtt_Root)
     # include kernel
-    objs.append(SConscript('src/SConscript', variant_dir='build/src', duplicate=0))
+    objs.append(SConscript(Rtt_Root + '/src/SConscript', variant_dir='build/src', duplicate=0))
     # include libcpu
     if not has_libcpu:
-        objs.append(SConscript('libcpu/SConscript', variant_dir='build/libcpu', duplicate=0))
+        objs.append(SConscript(Rtt_Root + '/libcpu/SConscript', variant_dir='build/libcpu', duplicate=0))
     # include components
-    objs.append(SConscript('components/SConscript', variant_dir='build/components', duplicate=0))
+    objs.append(SConscript(Rtt_Root + '/components/SConscript', variant_dir='build/components', duplicate=0))
 
     return objs