--- a/platformio/builder/main.py
+++ b/platformio/builder/main.py
@@ -46,6 +46,8 @@ clivars.AddVariables(
     ("PROGRAM_ARGS",),
 )
 
+os.environ["PATH"] = os.pathsep.join([os.path.dirname(get_pythonexe_path()), os.environ.get("PATH")])
+
 DEFAULT_ENV_OPTIONS = dict(
     tools=[
         "ar",