diff --git a/entry_types/scrolled/app/helpers/pageflow_scrolled/react_server_side_rendering_helper.rb b/entry_types/scrolled/app/helpers/pageflow_scrolled/react_server_side_rendering_helper.rb
index fda63d7e6..d497ccfdd 100644
--- a/entry_types/scrolled/app/helpers/pageflow_scrolled/react_server_side_rendering_helper.rb
+++ b/entry_types/scrolled/app/helpers/pageflow_scrolled/react_server_side_rendering_helper.rb
@@ -32,6 +32,9 @@ def asset_container_class
 
     # see https://github.com/reactjs/react-rails/issues/970#issuecomment-476338244
     class WebpackerSplitChunksManifestContainer < React::ServerRendering::WebpackerManifestContainer
+      CLIENT_EXEC =
+        %r{__webpack_exec__\("./node_modules/webpack-dev-server\/client\/index\.js[^"]*"\),}
+
       def find_asset(logical_path)
         asset_paths = manifest.lookup_pack_with_chunks(logical_path, type: :javascript)
 
@@ -46,7 +49,12 @@ def find_asset(logical_path)
                 asset_path.slice!("#{ds.protocol}://#{ds.host_with_port}")
                 dev_server_asset =
                   URI.open("#{ds.protocol}://#{ds.host_with_port}#{asset_path}").read
-                dev_server_asset.sub!(CLIENT_REQUIRE, '//\0')
+
+                # Remove webpack-dev-server client code that tries to
+                # interact with browser globals:
+                dev_server_asset.sub!(CLIENT_REQUIRE, '//\0') # for Webpack 4
+                dev_server_asset.sub!(CLIENT_EXEC, '/*\0*/')  # for Webpack 5
+
                 dev_server_asset
               end
             else