diff --git a/hgext/git/gitlog.py b/hgext/git/gitlog.py
--- a/hgext/git/gitlog.py
+++ b/hgext/git/gitlog.py
@@ -68,7 +68,8 @@
 
     def hasnode(self, n):
         t = self._db.execute(
-            'SELECT node FROM changelog WHERE node = ?', (n,)
+            'SELECT node FROM changelog WHERE node = ?',
+            (pycompat.sysstr(n),),
         ).fetchone()
         return t is not None