diff --git a/.gitattributes b/.gitattributes
index 397bc68eb..f51088262 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -22,6 +22,8 @@
 # for linguist; let github identify our project as C++ instead of C due to pcre2
 /pcre2-10.22/ linguist-vendored
 /pcre2-10.22/* linguist-vendored
+/muparser-2.2.5/ linguist-vendored
+/muparser-2.2.5/* linguist-vendored
 angular.js linguist-vendored
 /doc_src/* linguist-documentation
 *.fish linguist-language=fish