diff --git a/.gitignore b/.gitignore
index b26d5f7aa..db7f90d44 100644
--- a/.gitignore
+++ b/.gitignore
@@ -52,3 +52,7 @@ docs/_build/
 
 # PyBuilder
 target/
+
+# MSVC libraries test harness
+env.lst
+keep.lst