diff --git a/dnsapi/dns_world4you.sh b/dnsapi/dns_world4you.sh
index 87f6885f..3db6db72 100644
--- a/dnsapi/dns_world4you.sh
+++ b/dnsapi/dns_world4you.sh
@@ -59,7 +59,7 @@ AddDnsRecordForm[uniqueFormIdTTL]=$formidttl&AddDnsRecordForm[_token]=$form_toke
   if grep '302' >/dev/null <"$HTTP_HEADER"; then
     return 0
   else
-    _err "$(head -n 1 <"$HTTP_HEADER")"
+    _err "$(head_n 1 <"$HTTP_HEADER")"
     return 2
   fi
 }
@@ -118,7 +118,7 @@ DeleteDnsRecordForm[_token]=$form_token"
   if grep '302' >/dev/null <"$HTTP_HEADER"; then
     return 0
   else
-    _err "$(head -n 1 <"$HTTP_HEADER")"
+    _err "$(head_n 1 <"$HTTP_HEADER")"
     return 2
   fi
 }
@@ -183,6 +183,6 @@ _get_paketnr() {
 
   TLD="$domain"
   RECORD=$(echo "$fqdn" | cut -c"1-$((${#fqdn} - ${#TLD} - 1))")
-  PAKETNR=$(echo "$form" | _egrep_o "data-textfilter=\" $domain .* [0-9]*" | head -n 1 | _egrep_o "[0-9]*")
+  PAKETNR=$(echo "$form" | _egrep_o "data-textfilter=\" $domain .* [0-9]*" | head_n 1 | _egrep_o "[0-9]*")
   return 0
 }