diff --git a/src/swf_typed/_common.py b/src/swf_typed/_common.py
index 8d320eb..f9f3185 100644
--- a/src/swf_typed/_common.py
+++ b/src/swf_typed/_common.py
@@ -19,8 +19,6 @@
     v: k for k, v in is_deprecated_by_registration_status.items()
 }
 
-executor = concurrent.futures.ThreadPoolExecutor(max_workers=1)
-
 
 class _Sentinel:
     """Not-provided value sentinel."""
@@ -123,6 +121,7 @@ def iter_() -> t.Generator[T, None, None]:
             response = future.result()
         yield from (model(d) for d in response.get(data_key) or [])
 
+    executor = concurrent.futures.ThreadPoolExecutor(max_workers=1)
     response = call()
     return iter_()