diff --git a/packages/backend/src/server/csp.ts b/packages/backend/src/server/csp.ts
index 3e1e7962b8..adbebd0059 100644
--- a/packages/backend/src/server/csp.ts
+++ b/packages/backend/src/server/csp.ts
@@ -50,6 +50,7 @@ export function generateCSP(hashedMap: Map<string, CSPHashed>, options: {
             '\'wasm-unsafe-eval\'', 
             ...scripts
         ]],
+        ['worker-src', ['\'self\'', options.mediaProxy].filter(Boolean)],
         ['object-src', ['\'none\'']],
         ['base-uri', ['\'self\'']],
         ['form-action', ['\'self\'']],