diff --git a/sphinx_autobuild/middleware.py b/sphinx_autobuild/middleware.py
index 2652a0c..ae12575 100644
--- a/sphinx_autobuild/middleware.py
+++ b/sphinx_autobuild/middleware.py
@@ -38,6 +38,7 @@ async def send_wrapper(message: Message) -> None:
                     if "Content-Length" in headers:
                         length = int(headers["Content-Length"]) + len(self.script)
                         headers["Content-Length"] = str(length)
+                headers["Cache-Control"] = "no-cache"
             elif message["type"] == "http.response.body":
                 request_complete = not message.get("more_body", False)
                 if add_script and request_complete:
diff --git a/tests/test_application.py b/tests/test_application.py
index 6919d9a..e1e3be4 100644
--- a/tests/test_application.py
+++ b/tests/test_application.py
@@ -33,3 +33,4 @@ def test_application(tmp_path):
 
     response = client.get("/")
     assert response.status_code == 200
+    assert response.headers["Cache-Control"] == "no-cache"