diff --git a/src/script.sh b/src/script.sh
index ca04d25d..cee30d86 100644
--- a/src/script.sh
+++ b/src/script.sh
@@ -335,14 +335,14 @@ RPZ_SYNTAX="\n\$TTL 30\n@ IN SOA rpz.malware-filter.gitlab.io. hostmaster.rpz.ma
 
 cat "malware-hosts.txt" | \
 sed "s/$/ CNAME ./g" | \
-sed "1i $RPZ_SYNTAX" | \
+sed '1 i\'"$RPZ_SYNTAX"'' | \
 sed "1i $COMMENT" | \
 sed "s/^#/;/g" | \
 sed "1s/Blocklist/RPZ Blocklist/" > "../public/urlhaus-filter-rpz.conf"
 
 cat "malware-hosts-online.txt" | \
 sed "s/$/ CNAME ./g" | \
-sed "1i $RPZ_SYNTAX" | \
+sed '1 i\'"$RPZ_SYNTAX"'' | \
 sed "1i $COMMENT_ONLINE" | \
 sed "s/^#/;/g" | \
 sed "1s/Blocklist/RPZ Blocklist/" > "../public/urlhaus-filter-rpz-online.conf"