diff --git a/setupbase.py b/setupbase.py
index 16d28fe..34fd6f7 100644
--- a/setupbase.py
+++ b/setupbase.py
@@ -287,7 +287,7 @@ def target_update(target,deps,cmd):
     command if target is outdated."""
 
     if target_outdated(target,deps):
-        system(cmd)
+        os.system(cmd)
 
 #---------------------------------------------------------------------------
 # Find scripts