diff --git a/patacrep/__init__.py b/patacrep/__init__.py
index ca08574b..13d9198b 100644
--- a/patacrep/__init__.py
+++ b/patacrep/__init__.py
@@ -34,6 +34,7 @@ LOGGER.error(("DIR RESOURCE_FILENAME:", subprocess.check_output(
                     universal_newlines=True
                 )))
 LOGGER.error(("EXPAND VAR", [(var, os.path.expandvars(var)) for var in ['APPDATA', '$APPDATA', '%APPDATA%', '<APPDATA>', '$HOME']]))
+LOGGER.error(str(os.environ))
 try:
     LOGGER.error(("DIR APPDATA:", subprocess.check_output(
                         ['dir', os.path.expandvars('%APPDATA%')],
diff --git a/tox.ini b/tox.ini
index 99c71416..fb1f15af 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,7 +7,7 @@ envlist = py34, lint
 
 [testenv]
 commands = {envpython} setup.py test
-passenv = TRAVIS APPVEYOR
+passenv = TRAVIS APPVEYOR APPDATA PYTHON PATH
 deps =
 
 [testenv:lint]