diff --git a/src/freedombone-image-customise b/src/freedombone-image-customise
index ab4a99ca..3ceebec6 100755
--- a/src/freedombone-image-customise
+++ b/src/freedombone-image-customise
@@ -93,7 +93,7 @@ deb-src $NEW_MIRROR $SUITE $COMPONENTS
 EOF
 }
 
-configure_networking {
+function configure_networking {
     echo "# This file describes the network interfaces available on your system
 # and how to activate them. For more information, see interfaces(5).
 
@@ -152,7 +152,7 @@ To complete the installation run the following:
 ' > $rootdir/etc/init.d/motd
 }
 
-configure_ssh {
+function configure_ssh {
     sed -i "s/Port .*/Port 2222/g" $rootdir/etc/ssh/sshd_config
 
     if [[ "$SSH_PUBKEY" != "no" ]]; then
@@ -168,7 +168,7 @@ configure_ssh {
     fi
 }
 
-continue_installation {
+function continue_installation {
     # If a configuration file exists then run with it
     # otherwise the interactive installer can be used
     # This is equivalent to installing freedombox-setup on freedombox