diff --git a/src/apify_client/clients/resource_clients/actor.py b/src/apify_client/clients/resource_clients/actor.py
index 5a312a40..6c974050 100644
--- a/src/apify_client/clients/resource_clients/actor.py
+++ b/src/apify_client/clients/resource_clients/actor.py
@@ -439,7 +439,7 @@ def runs(self) -> RunCollectionClient:
         """Retrieve a client for the runs of this Actor."""
         return RunCollectionClient(**self._sub_resource_init_options(resource_path='runs'))
 
-    async def default_build(
+    def default_build(
         self,
         *,
         wait_for_finish: int | None = None,