diff --git a/testing/tests/api/externing.py b/testing/tests/api/externing.py
index 125c80b70..b3ccdcb9d 100644
--- a/testing/tests/api/externing.py
+++ b/testing/tests/api/externing.py
@@ -11,6 +11,7 @@ def testCdLsPwd(self):
         with testing.mkdtemp() as path:
             cmd.cd(path)
             if sys.platform == 'win32':
+                import ctypes
                 def get_long_path_name(path):
                     buf = ctypes.create_unicode_buffer(260)
                     ctypes.windll.kernel32.GetLongPathNameW(path, buf, len(buf))