diff --git a/build-tools/build-indexes b/build-tools/build-indexes
index 006ad6d76..a533e0d39 100755
--- a/build-tools/build-indexes
+++ b/build-tools/build-indexes
@@ -1028,6 +1028,16 @@ process.stdout.write("Building `data/moves,items,abilities,typechart,learnsets.j
 	fs.writeFileSync('data/formats-data.js', buf);
 }
 
+/*********************************************************
+ * Build formats.js
+ *********************************************************/
+
+{
+	const Formats = requireNoCache('../data/Pokemon-Showdown/.config-dist/formats.js').Formats;
+	const buf = 'exports.Formats = ' + es3stringify(Formats) + ';';
+	fs.writeFileSync('data/formats.js', buf);
+}
+
 /*********************************************************
  * Build learnsets.js
  *********************************************************/