diff --git a/setup/bootstrap.sh b/setup/bootstrap.sh
index 238109d..db59679 100644
--- a/setup/bootstrap.sh
+++ b/setup/bootstrap.sh
@@ -35,14 +35,14 @@ if [ -z "$TAG" ]; then
 
 	else
 		echo "This script must be run on a system running Ubuntu 18.04 or Ubuntu 14.04."
-		exit
+		exit 1
 	fi
 fi
 
 # Are we running as root?
 if [[ $EUID -ne 0 ]]; then
 	echo "This script must be run as root. Did you leave out sudo?"
-	exit
+	exit 1
 fi
 
 # Clone the Mail-in-a-Box repository if it doesn't exist.
@@ -73,7 +73,7 @@ if [ "$TAG" != `git describe` ]; then
 	git fetch --depth 1 --force --prune origin tag $TAG
 	if ! git checkout -q $TAG; then
 		echo "Update failed. Did you modify something in `pwd`?"
-		exit
+		exit 1
 	fi
 	echo
 fi
diff --git a/setup/preflight.sh b/setup/preflight.sh
index 2547c41..acaf80c 100644
--- a/setup/preflight.sh
+++ b/setup/preflight.sh
@@ -4,7 +4,7 @@ if [[ $EUID -ne 0 ]]; then
 	echo
 	echo "sudo $0"
 	echo
-	exit
+	exit 1
 fi
 
 # Check that we are running on Ubuntu 18.04 LTS (or 18.04.xx).
@@ -14,7 +14,7 @@ if [ "`lsb_release -d | sed 's/.*:\s*//' | sed 's/18\.04\.[0-9]/18.04/' `" != "U
 	lsb_release -d | sed 's/.*:\s*//'
 	echo
 	echo "We can't write scripts that run on every possible setup, sorry."
-	exit
+	exit 1
 fi
 
 # Check that we have enough memory.
diff --git a/tools/owncloud-restore.sh b/tools/owncloud-restore.sh
index c93a322..4b0ba4d 100755
--- a/tools/owncloud-restore.sh
+++ b/tools/owncloud-restore.sh
@@ -22,7 +22,7 @@ fi
 
 if [ ! -f $1/config.php ]; then
 	echo "This isn't a valid backup location"
-	exit
+	exit 1
 fi
 
 echo "Restoring backup from $1"