diff --git a/artiq/frontend/artiq_sinara_tester.py b/artiq/frontend/artiq_sinara_tester.py
index da702faee..fdf34c8a9 100755
--- a/artiq/frontend/artiq_sinara_tester.py
+++ b/artiq/frontend/artiq_sinara_tester.py
@@ -385,7 +385,7 @@ class SinaraTester(EnvExperiment):
 
 
 def main():
-    device_mgr = DeviceManager(DeviceDB("device_db.pyon"))
+    device_mgr = DeviceManager(DeviceDB("device_db.py"))
     try:
         experiment = SinaraTester((device_mgr, None, None, None))
         experiment.prepare()