diff --git a/python/pyarrow/tests/test_fs.py b/python/pyarrow/tests/test_fs.py
index 23fc405196070..287b744f5ef31 100644
--- a/python/pyarrow/tests/test_fs.py
+++ b/python/pyarrow/tests/test_fs.py
@@ -1910,7 +1910,7 @@ def test_concurrent_fs_init():
     code = """if 1:
         import threading
         import pytest
-        from pyarrow.fs import (FileSystem, S3FileSystem
+        from pyarrow.fs import (FileSystem, S3FileSystem,
                                 ensure_s3_initialized, finalize_s3) 
         threads = []
         for i in range(4):
@@ -1922,4 +1922,5 @@ def test_concurrent_fs_init():
             thread.join()
 
         finalize_s3()
-    """
+        """
+    subprocess.check_call([sys.executable, "-c", code])