diff --git a/include/tests_firewalls b/include/tests_firewalls
index f55f74e3..be8bb083 100644
--- a/include/tests_firewalls
+++ b/include/tests_firewalls
@@ -114,7 +114,7 @@
         do
             ${IPTABLESBINARY} -t "${t}" -S -w 1 2>/dev/zero |
             {
-                while IFS="\n" read -r line
+                while IFS="$(printf '\n')" read -r line
                 do
                     set -- ${line}
                     while [ $# -gt 0 ]
@@ -163,7 +163,7 @@
                 done
                 # resume
                 if [ ! "${SORTBINARY}" = "" ]; then eq="$( echo "${errqueue}" | ${SORTBINARY} -u )"; else eq="${errqueue}"; fi
-                echo "${eq}" | while IFS="\n" read -r eql
+                echo "${eq}" | while IFS="$(printf '\n')" read -r eql
                 do
                     if [ ! "$eql" = "" ]
                     then