diff --git a/.gitignore b/.gitignore
index 1cb6813..87e16a4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,6 +23,7 @@
 /binary_trees.exe
 /binary_trees_shared
 /binary_trees_shared.exe
+/build/
 /check_address_test
 /cleanup_test
 /cleanup_test.exe