diff --git a/micropython/net/webrepl/webrepl.py b/micropython/net/webrepl/webrepl.py
index 00da8155c..cfc5c79ca 100644
--- a/micropython/net/webrepl/webrepl.py
+++ b/micropython/net/webrepl/webrepl.py
@@ -78,6 +78,7 @@ def send_html(cl):
     cl.send(
         b"""\
 HTTP/1.0 200 OK\r
+Content-Type: text/html\r
 \r
 <base href=\""""
     )