diff --git a/hydropandas/io/bro.py b/hydropandas/io/bro.py
index 3ecc2f8d..db79e791 100644
--- a/hydropandas/io/bro.py
+++ b/hydropandas/io/bro.py
@@ -461,7 +461,7 @@ def _get_gmw_from_bro_id(bro_id, retries=0):
     gmws = tree.findall(".//dsgmw:GMW_PO", ns)
     if len(gmws) != 1:
         val_ind = req.text.find("valid")
-        valid = req.text[(val_ind + 9) : (val_ind + 14)]
+        valid = req.text[(val_ind + 9):(val_ind + 14)]
         if valid == "false" and retries < 5:
             logger.debug(
                 f"got invalid response for {bro_id}, trying again {retries+1}/4"