diff --git a/openfga_sdk/sync/client/client.py b/openfga_sdk/sync/client/client.py
index 1efa33f..15cdd86 100644
--- a/openfga_sdk/sync/client/client.py
+++ b/openfga_sdk/sync/client/client.py
@@ -121,6 +121,8 @@ def options_to_kwargs(
             kwargs["_headers"] = options["headers"]
         if options.get("retry_params"):
             kwargs["_retry_params"] = options["retry_params"]
+        if options.get("async_req") is not None:
+            kwargs["async_req"] = options["async_req"]
     return kwargs