diff --git a/std-script/compile b/std-script/compile
--- a/std-script/compile
+++ b/std-script/compile
@@ -18,7 +18,7 @@
   if ENV['GRADER_LOGGING']!=nil
     log_fname = ENV['GRADER_LOGGING']
     fp = File.open(log_fname,"a")
-    fp.puts("run: #{Time.new.strftime("%H:%M")} #{str}")
+    fp.puts("run: #{Time.new.strftime("%H:%M")} #{msg}")
     fp.close
   end
 end