diff --git a/test/test_envs.py b/test/test_envs.py
index e7a4337229c..704b389e133 100644
--- a/test/test_envs.py
+++ b/test/test_envs.py
@@ -3418,13 +3418,18 @@ class TestLibThreading:
     def test_num_threads(self):
         gc.collect()
         num_threads = torch.get_num_threads()
+        main_pid = os.getpid()
         try:
             # Wrap the env factory to check thread count inside the subprocess.
             # The env is created AFTER torch.set_num_threads() is called in the worker.
+            # Note: the factory is also called in the main process to get metadata,
+            # so we only check thread count when running in a subprocess.
             def make_env():
-                assert (
-                    torch.get_num_threads() == 3
-                ), f"Expected 3 threads, got {torch.get_num_threads()}"
+                if os.getpid() != main_pid:
+                    # Only check thread count in subprocess, not during metadata extraction
+                    assert (
+                        torch.get_num_threads() == 3
+                    ), f"Expected 3 threads, got {torch.get_num_threads()}"
                 return ContinuousActionVecMockEnv()
 
             env = ParallelEnv(2, make_env, num_sub_threads=3, num_threads=7)