diff --git a/setup/bootstrap.sh b/setup/bootstrap.sh
index 401bbe8b..db6ce25f 100644
--- a/setup/bootstrap.sh
+++ b/setup/bootstrap.sh
@@ -74,7 +74,7 @@ if [ ! -d "$HOME/mailinabox" ]; then
 fi
 
 # Change directory to it.
-cd "$HOME/mailinabox"
+cd "$HOME/mailinabox" || exit
 
 # Update it.
 if [ "$TAG" != $(git describe --always) ]; then