diff --git a/nginx/default.conf b/nginx/default.conf
index 1c85d50..c650692 100644
--- a/nginx/default.conf
+++ b/nginx/default.conf
@@ -10,7 +10,10 @@ server {
     }
 
     location ^~ /tts/piper-wasm-v1/ {
-        types { application/wasm wasm; }
+        types {
+            application/wasm wasm;
+            application/javascript js;
+        }
         add_header Cache-Control "public, max-age=31536000, immutable" always;
         try_files $uri =404;
     }
diff --git a/scripts/check-frontend.sh b/scripts/check-frontend.sh
index 383d867..4f6badd 100755
--- a/scripts/check-frontend.sh
+++ b/scripts/check-frontend.sh
@@ -8,6 +8,7 @@ grep -q '<script src="/voice.js?v=__FRONTEND_VERSION__"></script>' index.html
 grep -q '<script src="/piper-runtime.js?v=__FRONTEND_VERSION__"></script>' index.html
 grep -q 'no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0' nginx/default.conf
 grep -q 'Cross-Origin-Embedder-Policy "require-corp"' nginx/default.conf
+grep -q 'application/javascript js;' nginx/default.conf
 grep -q "request('/version')" index.html
 grep -Fq "credentials: 'same-origin'" index.html
 grep -q 'id="dialogue" aria-label="Dialoghistorik" role="log" aria-live="polite"' index.html