diff --git a/compressor/filters/css_default.py b/compressor/filters/css_default.py
index 6f2ffb9..93c19df 100644
--- a/compressor/filters/css_default.py
+++ b/compressor/filters/css_default.py
@@ -50,7 +50,7 @@ class CssAbsoluteFilter(FilterBase):
         if local_path.startswith(self.url_path):
             local_path = local_path.replace(self.url_path, "", 1)
         # Re-build the local full path by adding root
-        filename = os.path.join(self.root, local_path.lstrip(os.sep))
+        filename = os.path.join(self.root, local_path.lstrip('/'))
         return os.path.exists(filename) and filename
 
     def add_suffix(self, url):
diff --git a/tests/tests/base.py b/tests/tests/base.py
index 7ec94f9..4dc5608 100644
--- a/tests/tests/base.py
+++ b/tests/tests/base.py
@@ -41,9 +41,9 @@ class CompressorTestCase(TestCase):
 
     def test_css_split(self):
         out = [
-            (SOURCE_FILE, os.path.join(settings.COMPRESS_ROOT, u'css/one.css'), u'css/one.css', u'<link rel="stylesheet" href="/media/css/one.css" type="text/css" />'),
+            (SOURCE_FILE, os.path.join(settings.COMPRESS_ROOT, u'css', u'one.css'), u'css/one.css', u'<link rel="stylesheet" href="/media/css/one.css" type="text/css" />'),
             (SOURCE_HUNK, u'p { border:5px solid green;}', None, u'<style type="text/css">p { border:5px solid green;}</style>'),
-            (SOURCE_FILE, os.path.join(settings.COMPRESS_ROOT, u'css/two.css'), u'css/two.css', u'<link rel="stylesheet" href="/media/css/two.css" type="text/css" />'),
+            (SOURCE_FILE, os.path.join(settings.COMPRESS_ROOT, u'css', u'two.css'), u'css/two.css', u'<link rel="stylesheet" href="/media/css/two.css" type="text/css" />'),
         ]
         split = self.css_node.split_contents()
         split = [(x[0], x[1], x[2], self.css_node.parser.elem_str(x[3])) for x in split]
@@ -80,7 +80,7 @@ class CompressorTestCase(TestCase):
 
     def test_js_split(self):
         out = [
-            (SOURCE_FILE, os.path.join(settings.COMPRESS_ROOT, u'js/one.js'), u'js/one.js', '<script src="/media/js/one.js" type="text/javascript"></script>'),
+            (SOURCE_FILE, os.path.join(settings.COMPRESS_ROOT, u'js', u'one.js'), u'js/one.js', '<script src="/media/js/one.js" type="text/javascript"></script>'),
             (SOURCE_HUNK, u'obj.value = "value";', None, '<script type="text/javascript">obj.value = "value";</script>'),
         ]
         split = self.js_node.split_contents()
diff --git a/tests/tests/parsers.py b/tests/tests/parsers.py
index de6a0b3..3bf676a 100644
--- a/tests/tests/parsers.py
+++ b/tests/tests/parsers.py
@@ -45,9 +45,9 @@ class Html5LibParserTests(ParserTestCase, CompressorTestCase):
 
     def test_css_split(self):
         out = [
-            (SOURCE_FILE, os.path.join(settings.COMPRESS_ROOT, u'css/one.css'), u'css/one.css', u'<link href="/media/css/one.css" rel="stylesheet" type="text/css">'),
+            (SOURCE_FILE, os.path.join(settings.COMPRESS_ROOT, u'css', u'one.css'), u'css/one.css', u'<link href="/media/css/one.css" rel="stylesheet" type="text/css">'),
             (SOURCE_HUNK, u'p { border:5px solid green;}', None, u'<style type="text/css">p { border:5px solid green;}</style>'),
-            (SOURCE_FILE, os.path.join(settings.COMPRESS_ROOT, u'css/two.css'), u'css/two.css', u'<link href="/media/css/two.css" rel="stylesheet" type="text/css">'),
+            (SOURCE_FILE, os.path.join(settings.COMPRESS_ROOT, u'css', u'two.css'), u'css/two.css', u'<link href="/media/css/two.css" rel="stylesheet" type="text/css">'),
         ]
         split = self.css_node.split_contents()
         split = [(x[0], x[1], x[2], self.css_node.parser.elem_str(x[3])) for x in split]
@@ -55,7 +55,7 @@ class Html5LibParserTests(ParserTestCase, CompressorTestCase):
 
     def test_js_split(self):
         out = [
-            (SOURCE_FILE, os.path.join(settings.COMPRESS_ROOT, u'js/one.js'), u'js/one.js', u'<script src="/media/js/one.js" type="text/javascript"></script>'),
+            (SOURCE_FILE, os.path.join(settings.COMPRESS_ROOT, u'js', u'one.js'), u'js/one.js', u'<script src="/media/js/one.js" type="text/javascript"></script>'),
             (SOURCE_HUNK, u'obj.value = "value";', None, u'<script type="text/javascript">obj.value = "value";</script>'),
         ]
         split = self.js_node.split_contents()