diff --git a/build/cmake/.gitignore b/build/cmake/.gitignore
index 7fdc987..357c157 100644
--- a/build/cmake/.gitignore
+++ b/build/cmake/.gitignore
@@ -29,4 +29,5 @@ _CPack_Packages/*
 *.wixobj
 tidy
 libtidy*
+tidy1.xsl