diff --git a/install_opendkim.sh b/install_opendkim.sh
index e902b5e..2fcf58f 100755
--- a/install_opendkim.sh
+++ b/install_opendkim.sh
@@ -487,7 +487,8 @@ while IFS='' read -r _line || [[ -n $_line ]] ; do
 
    if $_found && ! echo "$_line" | grep -i -q -E "^\s*-o" 2> /dev/null ; then
       echo "   -o smtpd_milters=" >> "$tmp_master_file"
-      changed=true
+      _changed=true
+      _found=false
    fi
 
    if $_found && echo "$_line" | grep -i -q -E "^\s*-o\s+smtpd_milters=\s*" ; then