diff --git a/app/models/channel/email_build.rb b/app/models/channel/email_build.rb
index 034d5783d..b0692648f 100644
--- a/app/models/channel/email_build.rb
+++ b/app/models/channel/email_build.rb
@@ -158,7 +158,7 @@ Check if string is a complete html document. If not, add head and css styles.
 
     # use block form because variable html could contain backslashes and e. g. '\1' that
     # must not be handled as back-references for regular expressions
-    Rails.configuration.html_email_body.sub('###html###') {html}
+    Rails.configuration.html_email_body.sub('###html###') { html }
   end
 
 =begin