diff --git a/config/routes.rb b/config/routes.rb
index ab8de6a96e..31e8bb8dee 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -67,8 +67,10 @@
   get "/find-licences/:slug/:authority_slug", to: "licence_transaction#authority", as: "licence_transaction_authority"
   get "/find-licences/:slug/:authority_slug/:interaction", to: "licence_transaction#authority_interaction", as: "licence_transaction_authority_interaction"
 
-  # Media previews
+  # Old style media previews (compatible with preview_url)
   get "/media/:id/:filename/preview", to: "csv_preview#show", filename: /[^\/]+/
+  # New style CSV previews (using a different path to avoid the special routing for preview_url)
+  get "/csv-preview/:id/:filename", to: "csv_preview#show", filename: /[^\/]+/
 
   scope "/government" do
     # Placeholder for attachments being virus-scanned
diff --git a/spec/routing/csv_previews_spec.rb b/spec/routing/csv_previews_spec.rb
new file mode 100644
index 0000000000..dbe534f5a3
--- /dev/null
+++ b/spec/routing/csv_previews_spec.rb
@@ -0,0 +1,19 @@
+RSpec.describe "CSV previews" do
+  it "routes old style paths to the CsvPreviewController" do
+    expect(get("/media/000000000000000000000000/some-file.csv/preview")).to route_to(
+      controller: "csv_preview",
+      action: "show",
+      id: "000000000000000000000000",
+      filename: "some-file.csv",
+    )
+  end
+
+  it "routes new style paths to the CsvPreviewController" do
+    expect(get("/csv-preview/000000000000000000000000/some-file.csv")).to route_to(
+      controller: "csv_preview",
+      action: "show",
+      id: "000000000000000000000000",
+      filename: "some-file.csv",
+    )
+  end
+end