diff --git a/config.sample/dkim/dkim_key_gen.sh b/config.sample/dkim/dkim_key_gen.sh
index 586f30e..c147965 100755
--- a/config.sample/dkim/dkim_key_gen.sh
+++ b/config.sample/dkim/dkim_key_gen.sh
@@ -44,7 +44,7 @@ With SPF:
 
 With DMARC:
 
-_dmarc  TXT "v=DMARC1; p=reject; adkim=s; aspf=r; rua=mailto:dmarc-feedback@$DOMAIN; ruf=mailto:dmarc-feedback@'$DOMAIN; pct=100"
+_dmarc  TXT "v=DMARC1; p=reject; adkim=s; aspf=r; rua=mailto:dmarc-feedback@$DOMAIN; ruf=mailto:dmarc-feedback@$DOMAIN; pct=100"
 
 With DomainKeys (deprecated)