diff --git a/config/action.d/sendmail-whois-lines.conf b/config/action.d/sendmail-whois-lines.conf
index 7340d3cd..0f5e342d 100644
--- a/config/action.d/sendmail-whois-lines.conf
+++ b/config/action.d/sendmail-whois-lines.conf
@@ -11,9 +11,6 @@ before = common.conf
 
 [Definition]
 
-# To avoid duplication -- define variable for the content-type
-ContentType = Content-Type: text/plain; charset=`locale | awk -F= '/LC_CTYPE/{ print $2; }'`
-
 # Option:  actionstart
 # Notes.:  command executed once at the start of Fail2Ban.
 # Values:  CMD