diff --git a/lib/testdata_importer.rb b/lib/testdata_importer.rb
--- a/lib/testdata_importer.rb
+++ b/lib/testdata_importer.rb
@@ -70,6 +70,8 @@
     files = Dir["#{extract_dir}/**/*1*.in"]
     return nil if files.length==0
 
+    File.delete(testdata_filename)
+
     return File.dirname(files[0])
   end