diff --git a/CHANGES/1546.bugfix.rst b/CHANGES/1546.bugfix.rst
new file mode 100644
index 00000000..a98d5904
--- /dev/null
+++ b/CHANGES/1546.bugfix.rst
@@ -0,0 +1 @@
+Fixed URL path in the "Open" button at the "demo/sendMessage" endpoint in the web_app example.
diff --git a/examples/web_app/routes.py b/examples/web_app/routes.py
index bd913a12..a1f2da3d 100644
--- a/examples/web_app/routes.py
+++ b/examples/web_app/routes.py
@@ -43,7 +43,7 @@ async def send_message_handler(request: Request):
                 [
                     InlineKeyboardButton(
                         text="Open",
-                        web_app=WebAppInfo(url=str(request.url.with_scheme("https"))),
+                        web_app=WebAppInfo(url=str(request.url.with_scheme("https").with_path("demo"))),
                     )
                 ]
             ]