diff --git a/src/db.js b/src/db.js
index fcaf4b7..a56d598 100644
--- a/src/db.js
+++ b/src/db.js
@@ -394,7 +394,7 @@ function mongo_package_stream(pkg, universe){
   var query = {Package: pkg, _user: universe, _type: 'src'};
   return packages.findOne(query, {sort: {'_id': -1}}).then(function(x){
     if(!x)
-      throw `Package ${pkg} not found in ${universe}`;
+      throw createError(404, `Package ${pkg} not found in ${universe}`);
     return bucket.openDownloadStream(x._fileid);
   });
 }
diff --git a/src/tools.js b/src/tools.js
index 020a30e..f333c3e 100644
--- a/src/tools.js
+++ b/src/tools.js
@@ -3,6 +3,7 @@ import tar from 'tar-stream';
 import gunzip from 'gunzip-maybe';
 import {load as cheerio_load} from 'cheerio';
 import hljs from 'highlight.js';
+import createError from 'http-errors';
 
 export const pkgfields = {_id: 1, _type:1, _fileid:1, _dependencies: 1, Filesize: '$_filesize', Distro: '$_distro',
   SHA256: '$_sha256', Package: 1, Version: 1, Depends: 1, Suggests: 1, License: 1,
@@ -170,5 +171,5 @@ export function match_macos_arch(platform){
   if(platform.match("x86_64")){
     return {$not : /aarch64/};
   }
-  throw `Unknown platform: ${platform}`;
+  throw createError(404, `Unsupported MacOS version: ${platform}`);
 }