diff --git a/verifiers/serve/server/env_server.py b/verifiers/serve/server/env_server.py
index 70d97a888..faf0ff468 100644
--- a/verifiers/serve/server/env_server.py
+++ b/verifiers/serve/server/env_server.py
@@ -87,6 +87,10 @@ async def close(self) -> None:
 
     async def run(self) -> None:
         """Run the server with signal-based graceful shutdown."""
+        from verifiers.utils.thread_utils import install_default_executor
+
+        install_default_executor()
+
         if self.death_pipe is not None:
             monitor_death_pipe(self.death_pipe)