diff --git a/couchpotato/core/helpers/variable.py b/couchpotato/core/helpers/variable.py
index f98adaa2..b3de6833 100644
--- a/couchpotato/core/helpers/variable.py
+++ b/couchpotato/core/helpers/variable.py
@@ -294,8 +294,8 @@ def dictIsSubset(a, b):
 # Returns True if sub_folder is the same as or inside base_folder
 def isSubFolder(sub_folder, base_folder):
     if base_folder and sub_folder:
-        base = sp(os.path.realpath(base_folder))
-        subfolder = sp(os.path.realpath(sub_folder))
+        base = sp(os.path.realpath(base_folder)) + os.path.sep
+        subfolder = sp(os.path.realpath(sub_folder)) + os.path.sep
         return os.path.commonprefix([subfolder, base]) == base
 
     return False
diff --git a/couchpotato/core/plugins/file.py b/couchpotato/core/plugins/file.py
index 2145ffeb..80c073fc 100644
--- a/couchpotato/core/plugins/file.py
+++ b/couchpotato/core/plugins/file.py
@@ -82,6 +82,7 @@ class FileManager(Plugin):
     def doSubfolderTest(self):
 
         tests = {
+            ('/test/subfolder', '/test/sub'): False,
             ('/test/sub/folder', '/test/sub'): True,
             ('/test/sub/folder', '/test/sub2'): False,
             ('/sub/fold', '/test/sub/fold'): False,