diff --git a/.gitignore b/.gitignore
index e75986ac1b..458627cda2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -60,6 +60,7 @@ Build.APMrover2/*
 Build.AntennaTracker/*
 Build.ArduCopter/*
 Build.ArduPlane/*
+Build.ArduSub/*
 CMakeCache.txt
 CMakeFiles
 LASTLOG.TXT