diff --git a/docs/platforms/creating_platform.rst b/docs/platforms/creating_platform.rst
index 3497fe88..dfbd0bdc 100644
--- a/docs/platforms/creating_platform.rst
+++ b/docs/platforms/creating_platform.rst
@@ -145,6 +145,8 @@ Example of the **test** platform (``test.py``):
 
 .. code-block:: python
 
+    import os
+
     from platformio.platforms.base import BasePlatform
 
     class TestPlatform(BasePlatform):