diff --git a/generate.sh b/generate.sh
index 00215e96..c752413e 100755
--- a/generate.sh
+++ b/generate.sh
@@ -4,8 +4,7 @@ source common.sh
 set -e
 [[ $SKIP_DATA_PREPARATION != true ]] && prepare_data
 mkdir -p result
-ls operator/*.conf |
-while read file; do
+for file in operator/*.conf; do
 	operator=${file%.*}
 	operator=${operator##*/}
 	log_info "generating IP list of $operator ..."