diff --git a/couchpotato/core/_base/_core.py b/couchpotato/core/_base/_core.py
index 91cb97e9..1171478d 100644
--- a/couchpotato/core/_base/_core.py
+++ b/couchpotato/core/_base/_core.py
@@ -8,7 +8,7 @@ import webbrowser
 
 from couchpotato.api import addApiView
 from couchpotato.core.event import fireEvent, addEvent
-from couchpotato.core.helpers.variable import cleanHost, md5
+from couchpotato.core.helpers.variable import cleanHost, md5, isSubFolder
 from couchpotato.core.logger import CPLog
 from couchpotato.core.plugins.base import Plugin
 from couchpotato.environment import Env
@@ -71,7 +71,7 @@ class Core(Plugin):
         return value if value and len(value) > 3 else uuid4().hex
 
     def checkDataDir(self):
-        if Env.get('app_dir') in Env.get('data_dir'):
+        if isSubFolder(Env.get('data_dir'), Env.get('app_dir')):
             log.error('You should NOT use your CouchPotato directory to save your settings in. Files will get overwritten or be deleted.')
 
         return True