diff --git a/start-nginx.sh b/start-nginx.sh
index c01c38a..d86f25a 100755
--- a/start-nginx.sh
+++ b/start-nginx.sh
@@ -38,12 +38,12 @@ run_nginx() {
 run_inotifywait() {
     while :; do
         wait_files="$(find "$dstdir" -type f -exec \
-            sed -En '/ssl_certificate/ s/^\s*ssl_certificate(_key)? (.*);.*$/\2/p' {} \; | sort | uniq)"
-        wait_directories="$(echo "$wait_files" | xargs -0 dirname | sort | uniq)"
+            sed -En '/ssl_certificate/ s/^\s*ssl_certificate(_key)? (.*);.*$/\2/p' {} \; | sort -u)"
+        wait_directories="$(echo "$wait_files" | xargs -n 1 dirname | sort -u)"
         echo "monitoring the following files:"
         echo "$wait_files"
         matched_files="$(echo "$wait_directories" | inotifywait --fromfile=- -e close_write -e modify -e create)"
-        if [[ -n "$(comm -12 <(sort <<< "$matched_files") <(echo "$wait_files"))" ]]; then
+        if [[ -n "$(comm -12 <(sort -u <<< "$matched_files") <(echo "$wait_files"))" ]]; then
             nginx -s reload
         fi
     done