diff --git a/.gitignore b/.gitignore
index 3e9185713d..81d9f02e82 100644
--- a/.gitignore
+++ b/.gitignore
@@ -75,3 +75,6 @@ uberenv_libs
 
 # swig
 /swig/swig
+
+# tools
+/tools/suntools/__pycache__