diff --git a/db/fixtures/990_settings.rb b/db/fixtures/990_settings.rb
index 7086f6b1cd9..6f21e588131 100644
--- a/db/fixtures/990_settings.rb
+++ b/db/fixtures/990_settings.rb
@@ -5,6 +5,8 @@ if SiteSetting.notification_email == SiteSetting.defaults[:notification_email]
   begin
     SiteSetting.notification_email = "noreply@#{Discourse.current_hostname}"
   rescue Discourse::InvalidParameters
-    STDERR.puts "Discourse hostname: #{Discourse.current_hostname} is not a valid domain for emails!"
+    if Rails.env.production?
+      STDERR.puts "WARNING: Discourse hostname: #{Discourse.current_hostname} is not a valid domain for emails!"
+    end
   end
 end