diff --git a/fastapi/openapi/docs.py b/fastapi/openapi/docs.py
index 632cc2c1d9..bb387c609a 100644
--- a/fastapi/openapi/docs.py
+++ b/fastapi/openapi/docs.py
@@ -139,6 +139,7 @@ def get_swagger_ui_html(
     <!DOCTYPE html>
     <html>
     <head>
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <link type="text/css" rel="stylesheet" href="{swagger_css_url}">
     <link rel="shortcut icon" href="{swagger_favicon_url}">
     <title>{title}</title>
