diff --git a/resources/brew.sh b/resources/brew.sh
index f1e68270..da65d3f6 100755
--- a/resources/brew.sh
+++ b/resources/brew.sh
@@ -44,6 +44,7 @@ brew link daemonize
 brew install ngrep
 brew install gist
 brew install gawk
+brew install pstree
 
 # Remove outdated versions from the cellar
 brew cleanup