diff --git a/letsencrypt.sh b/letsencrypt.sh
index 522fc53..e941e31 100755
--- a/letsencrypt.sh
+++ b/letsencrypt.sh
@@ -104,6 +104,6 @@ if [ "${register}" = "1" ]; then
   signed_request "${CA}/acme/new-reg" '{"resource": "new-reg", "agreement": "https://letsencrypt.org/documents/LE-SA-v1.0.1-July-27-2015.pdf"}' > /dev/null
 fi
 
-cat domains.txt | sed 's/^\s*//g;s/\s*$//g' | grep -v '^#' | grep -v '^$' | while read line; do
-  sign_domain $line
+<domains.txt sed 's/^\s*//g;s/\s*$//g' | grep -v '^#' | grep -v '^$' | while read line; do
+  sign_domain "$line"
 done