diff --git a/install_postfix_advanced.sh b/install_postfix_advanced.sh
index 19df54f..0864b0b 100755
--- a/install_postfix_advanced.sh
+++ b/install_postfix_advanced.sh
@@ -4164,7 +4164,7 @@ EOF
 
    # - Add support for policyd-spf service
    # -
-   if ! $(grep -iq -E "^policyd-spf\s+" "$postfix_master_cf" 2> /dev/null) ; then
+   if ! grep -iq -E "^policy-spf\s+" "$postfix_master_cf" 2> /dev/null ; then
       cat <<EOF >> $postfix_master_cf
 
 policy-spf  unix  -       n       n       -       0       spawn
@@ -4175,7 +4175,7 @@ EOF
 
    # - Add transport definitions for only sending over IPv4/IPv6
    # -
-   if ! $(grep -iq -E "^smtp-ipv4-only\s+" "$postfix_master_cf" 2> /dev/null) ; then
+   if ! grep -iq -E "^smtp-ipv4-only\s+" "$postfix_master_cf" 2> /dev/null ; then
       cat <<EOF >> $postfix_master_cf
 
 smtp-ipv4-only      unix  -       -       n       -       -       smtp
@@ -4183,7 +4183,7 @@ smtp-ipv4-only      unix  -       -       n       -       -       smtp
 EOF
    fi
 
-   if ! $(grep -iq -E "^smtp-ipv6-only\s+" "$postfix_master_cf" 2> /dev/null) ; then
+   if ! grep -iq -E "^smtp-ipv6-only\s+" "$postfix_master_cf" 2> /dev/null ; then
       cat <<EOF >> $postfix_master_cf
 
 smtp-ipv6-only      unix  -       -       n       -       -       smtp