diff --git a/lib/redmine.rb b/lib/redmine.rb
index 64d63dbb6..0c78b99d9 100644
--- a/lib/redmine.rb
+++ b/lib/redmine.rb
@@ -23,7 +23,7 @@ rescue LoadError
   # RMagick is not available
 end
 begin
-  require 'Redcarpet' unless Object.const_defined?(:Redcarpet)
+  require 'redcarpet' unless Object.const_defined?(:Redcarpet)
 rescue LoadError
   # Redcarpet is not available
 end