diff --git a/lib/fluent/engine.rb b/lib/fluent/engine.rb
index <HASH>..<HASH> 100644
--- a/lib/fluent/engine.rb
+++ b/lib/fluent/engine.rb
@@ -74,7 +74,7 @@ module Fluent
     end
 
     def configure(conf)
-      $log.info "using configuration file: #{conf.to_s.rstrip}"
+      $log.debug "using configuration file: #{conf.to_s.rstrip}"
 
       conf.elements.select {|e|
         e.name == 'source'
Suppress dumping of whole configuratinos by default