diff --git a/.templates/90-config_yaml.sh b/.templates/90-config_yaml.sh
index 1d94a0746..13aa9813c 100755
--- a/.templates/90-config_yaml.sh
+++ b/.templates/90-config_yaml.sh
@@ -66,7 +66,7 @@ sed -i '/^ /d' /tempenv
 sed -i '/^$/d' /tempenv
 
 # Exit if empty
-if ! -s /tempenv; then
+if [ ! -s /tempenv ]; then
     exit 0
 fi