diff --git a/conf/nginx.conf b/conf/nginx.conf
index c272291..e05466f 100644
--- a/conf/nginx.conf
+++ b/conf/nginx.conf
@@ -96,6 +96,14 @@ if ($unsafe) {
 # Finally, set all the rules you composed above.
 more_set_headers "Content-Security-Policy: default-src 'none'; child-src $childSrc; worker-src $workerSrc; media-src $mediaSrc; style-src $styleSrc; script-src $scriptSrc; connect-src $connectSrc; font-src $fontSrc; img-src $imgSrc; frame-src $frameSrc; frame-ancestors $frameAncestors";
 
+# Include mime.types to be able to support .mjs files (see "types" below)
+include mime.types;
+
+# Add support for .mjs files used by pdfjs
+types {
+    application/javascript mjs;
+}
+
 location ^~ /cryptpad_websocket {
     proxy_pass http://127.0.0.1:__PORT__;
     proxy_set_header X-Real-IP $remote_addr;