diff --git a/tests/test_parser.py b/tests/test_parser.py
index fa05c65..8d7c8a9 100644
--- a/tests/test_parser.py
+++ b/tests/test_parser.py
@@ -1,4 +1,5 @@
 # -*- coding: utf-8 -*-
+import os
 import sys
 import threading
 
@@ -41,7 +42,7 @@ def test_include():
 
 
 def test_include_with_module_name_prefix():
-    load('parser-cases/include.thrift', module_name='parser_cases.include_thrift')
+    load('parser-cases' + os.sep + 'include.thrift', module_name='parser_cases.include_thrift')
     assert sys.modules['parser_cases.include_thrift'] is not None
     assert sys.modules['parser_cases.included_thrift'] is not None
     assert sys.modules['parser_cases.include.included_1_thrift'] is not None
@@ -50,7 +51,7 @@ def test_include_with_module_name_prefix():
 
 def test_include_conflict():
     with pytest.raises(ThriftParserError) as excinfo:
-        load('parser-cases/foo.bar.thrift', module_name='foo.bar_thrift')
+        load('parser-cases' + os.sep + 'foo.bar.thrift', module_name='foo.bar_thrift')
     assert 'Module name conflict between "parser-cases/foo.bar.thrift" and "parser-cases/foo/bar.thrift"' == str(excinfo.value)