diff --git a/create_master_zone_file.sh b/create_master_zone_file.sh
index 4e31927..29008d2 100755
--- a/create_master_zone_file.sh
+++ b/create_master_zone_file.sh
@@ -740,7 +740,7 @@ EOF
 ;
 ; TXT (u.a. SPF)
 ;
-@               3600 IN TXT   "v=spf1 a mx mx:lists.warenform.de mx mx:lists.oopen.de mx:lists.initiativenserver.de mx:listi.jpberlin.de ~all"
+@               3600 IN TXT   "v=spf1 a mx mx:lists.warenform.de mx:lists.oopen.de mx:lists.initiativenserver.de mx:listi.jpberlin.de ~all"
 
 ;
 ; DMARC