diff --git a/.gitignore b/.gitignore
index 89df1e9e6529..c24914a665b2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -34,6 +34,7 @@ Source/ThirdParty/kdbush.js
 Source/ThirdParty/ktx-parse.js
 Source/ThirdParty/lerc.js
 Source/ThirdParty/mersenne-twister.js
+Source/ThirdParty/meshoptimizer.js
 Source/ThirdParty/nosleep.js
 Source/ThirdParty/pako.js
 Source/ThirdParty/protobufjs.js