diff --git a/tools/conv.py b/tools/conv.py
index 5084660ff..cb8f05731 100644
--- a/tools/conv.py
+++ b/tools/conv.py
@@ -24,7 +24,7 @@ sqfolder = env.str("LNBITS_DATA_FOLDER", default=None)
 LNBITS_DATABASE_URL = env.str("LNBITS_DATABASE_URL", default=None)
 if LNBITS_DATABASE_URL is None:
     print("missing LNBITS_DATABASE_URL")
-    sys.exit(1)
+    os.sys.exit(1)
 else:
     # parse postgres://lnbits:postgres@localhost:5432/lnbits
     pgdb = LNBITS_DATABASE_URL.split("/")[-1]