diff --git a/greentest/generate_report.py b/greentest/generate_report.py
index 0e9b3b2..b95de85 100755
--- a/greentest/generate_report.py
+++ b/greentest/generate_report.py
@@ -221,7 +221,7 @@ def main(db):
 
 if __name__=='__main__':
     if not sys.argv[1:]:
-        latest_db = sorted(glob.glob('results.*.db'))[-1]
+        latest_db = sorted(glob.glob('results.*.db'), key=lambda f: os.stat(f).st_mtime)[-1]
         print latest_db
         sys.argv.append(latest_db)
     for db in sys.argv[1:]: