diff --git a/test.py b/test.py
index 689bc87..c4cb58a 100644
--- a/test.py
+++ b/test.py
@@ -2392,11 +2392,11 @@ def testReflexivePaths(self):
         map = compile(mml_data, dirs)
         
         img_path = map.layers[0].styles[0].rules[0].symbolizers[0].file
-        assert img_path.startswith(self.tmpdir1)
+        assert img_path.startswith(self.tmpdir1), 'Assert that "%s" starts with "%s"' % (img_path, self.tmpdir1)
         assert os.path.exists(img_path)
         
         shp_path = map.layers[0].datasource.parameters['file'] + '.shp'
-        assert shp_path.startswith(self.tmpdir1)
+        assert shp_path.startswith(self.tmpdir1), 'Assert that "%s" starts with "%s"' % (shp_path, self.tmpdir1)
         assert os.path.exists(shp_path)
         
 if __name__ == '__main__':