--- a/hgext3rd/evolve/stablerangecache.py	Tue Aug 06 11:34:31 2019 +0200
+++ b/hgext3rd/evolve/stablerangecache.py	Tue Aug 06 11:35:09 2019 +0200
@@ -240,7 +240,7 @@
         except OSError:
             return None
         con = sqlite3.connect(encoding.strfromlocal(self._path), timeout=30,
-                              isolation_level="IMMEDIATE")
+                              isolation_level=r"IMMEDIATE")
         con.text_factory = bytes
         return con