diff --git a/gns3server/handlers/index_handler.py b/gns3server/handlers/index_handler.py
index 6dfd6c15..8c6a486f 100644
--- a/gns3server/handlers/index_handler.py
+++ b/gns3server/handlers/index_handler.py
@@ -90,7 +90,7 @@ class IndexHandler:
         static = get_static_path(filename)
 
         if not os.path.exists(static):
-            static = get_static_path('web-ui/index.html')
+            static = get_static_path(os.path.join('web-ui', 'index.html'))
 
         yield from response.file(static)
 
diff --git a/tests/utils/test_static.py b/tests/utils/test_static.py
index 0174275c..8fec0f25 100644
--- a/tests/utils/test_static.py
+++ b/tests/utils/test_static.py
@@ -15,8 +15,11 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+import os
+
 from gns3server.utils.static import get_static_path
 
 
 def test_get_static_path():
-    assert get_static_path('test').endswith('gns3server/static/test')
+    expected = os.path.join('gns3server', 'static', 'test')
+    assert get_static_path('test').endswith(expected)