diff --git a/rosetta/poutil.py b/rosetta/poutil.py
index abdf056..cac3996 100644
--- a/rosetta/poutil.py
+++ b/rosetta/poutil.py
@@ -116,6 +116,8 @@ def find_pos(lang, project_apps=True, django_apps=False, third_party_apps=False)
         if path not in rosetta_settings.ROSETTA_EXCLUDED_PATHS:
             for lang_ in langs:
                 dirname = os.path.join(path, lang_, 'LC_MESSAGES')
+                if not case_sensitive_file_system:
+                    dirname = dirname.lower()
                 for fn in rosetta_settings.POFILENAMES:
                     filename = os.path.join(dirname, fn)
                     if os.path.isfile(filename):