diff --git a/.templates/01-config_yaml.sh b/.templates/01-config_yaml.sh
index 4dbfd92c8..e302258bd 100755
--- a/.templates/01-config_yaml.sh
+++ b/.templates/01-config_yaml.sh
@@ -13,7 +13,7 @@ if [ ! -d /config ]; then
 fi
 
 # Define slug
-slug="${HOSTNAME//-/_}"
+slug="${HOSTNAME/-/_}"
 
 # Check type of config folder
 if [ ! -f /config/configuration.yaml ] && [ ! -f /config/configuration.json ]; then