diff --git a/letsencrypt.sh b/letsencrypt.sh
index f1e314c..55ce63d 100755
--- a/letsencrypt.sh
+++ b/letsencrypt.sh
@@ -43,11 +43,11 @@ hex2bin() {
 _request() {
   temperr="$(mktemp)"
   if [ "${1}" = "head" ]; then
-    curl -sSf -I "${2}" 2>${temperr}
+    curl -sSf -I "${2}" 2>"${temperr}"
   elif [ "${1}" = "get" ]; then
-    curl -sSf "${2}" 2>${temperr}
+    curl -sSf "${2}" 2>"${temperr}"
   elif [ "${1}" = "post" ]; then
-    curl -sSf "${2}" -d "${3}" 2>${temperr}
+    curl -sSf "${2}" -d "${3}" 2>"${temperr}"
   fi
   if [ ! -z "$(<${temperr})" ]; then echo "  + ERROR: An error occured while sending ${1}-request to ${2} ($(<"${temperr}"))" >&2; exit 1; fi
   rm -f "${temperr}"