diff --git a/gvol/client.py b/gvol/client.py
index 1fb251d..6bf3783 100644
--- a/gvol/client.py
+++ b/gvol/client.py
@@ -1619,4 +1619,5 @@ def options_cumulative_net_positioning_hist(
         """
         return self._client.execute(
             gql(queries.options_cumulative_net_positioning_hist),
-            variable_values={"symbol":symbol, "exchange":exchange, "dateStart":dateStart, "dateEnd":dateEnd}      
+            variable_values={"symbol":symbol, "exchange":exchange, "dateStart":dateStart, "dateEnd":dateEnd}    
+        )