diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 947f642..f9e089d 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -13,7 +13,7 @@ jobs:
     name: tests
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest]  # TODO: add windows-latest
+        os: [ubuntu-latest, macos-latest, windows-latest]
         python: ['3.8', '3.9', '3.10', '3.11', '3.12']
       fail-fast: false
     runs-on: ${{ matrix.os }}
diff --git a/src/flask_assets.py b/src/flask_assets.py
index 026f987..22d78c5 100644
--- a/src/flask_assets.py
+++ b/src/flask_assets.py
@@ -275,6 +275,9 @@ def convert_item_to_flask_url(self, ctx, item, filepath=None):
         else:
             filename = rel_path
 
+        # Windows compatibility
+        filename = filename.replace("\\", "/")
+
         flask_ctx = None
         if not has_request_context():
             flask_ctx = ctx.environment._app.test_request_context()