diff --git a/config/routes.rb b/config/routes.rb
index 221a1999f..7abda8934 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -11,7 +11,7 @@
 
   get "healthcheck", to: proc { [200, {}, [""]] }
 
-  get "/government/uploads/*path" => "asset_manager_redirect#show", format: true
+  get "/government/uploads/*path" => "asset_manager_redirect#show", format: false
 
   get "*path/:variant" => "content_items#show",
       constraints: {
diff --git a/test/controllers/asset_manager_redirect_controller_test.rb b/test/controllers/asset_manager_redirect_controller_test.rb
index 61a4c15f3..b32bc2867 100644
--- a/test/controllers/asset_manager_redirect_controller_test.rb
+++ b/test/controllers/asset_manager_redirect_controller_test.rb
@@ -8,15 +8,22 @@ class AssetManagerRedirectControllerTest < ActionController::TestCase
 
   test "redirects asset requests made via public host to the public asset host" do
     request.host = "some-host.com"
-    get :show, params: { path: "asset", format: "txt" }
+    get :show, params: { path: "asset.txt" }
 
     assert_redirected_to "http://asset-host.com/government/uploads/asset.txt"
   end
 
   test "redirects asset requests made via draft host to the draft asset host" do
     request.host = "draft-some-host.com"
-    get :show, params: { path: "asset", format: "txt" }
+    get :show, params: { path: "asset.txt" }
 
     assert_redirected_to "http://draft-asset-host.com/government/uploads/asset.txt"
   end
+
+  test "redirects asset preview requests made via public host to the public asset host" do
+    request.host = "some-host.com"
+    get :show, params: { path: "asset.csv/preview" }
+
+    assert_redirected_to "http://asset-host.com/government/uploads/asset.csv/preview"
+  end
 end