diff --git a/pifpaf/drivers/postgresql.py b/pifpaf/drivers/postgresql.py
index 8721244..e817e9d 100644
--- a/pifpaf/drivers/postgresql.py
+++ b/pifpaf/drivers/postgresql.py
@@ -52,7 +52,7 @@ def _setUp(self):
         self.putenv("PGDATA", self.tempdir, True)
         self.putenv("PGDATABASE", "postgres", True)
         _, pgbindir = self._exec(["pg_config", "--bindir"], stdout=True)
-        pgctl = os.path.join(pgbindir.strip(), b"pg_ctl")
+        pgctl = os.path.join(pgbindir.strip().decode(), "pg_ctl")
         self._exec([pgctl, "-o", "'-A trust'", "initdb"])
         if not self.sync:
             cfgfile = os.path.join(self.tempdir, 'postgresql.conf')