diff --git a/lib/redmine/scm/adapters/cvs_adapter.rb b/lib/redmine/scm/adapters/cvs_adapter.rb
index ec7ce7bcf..92be4389e 100644
--- a/lib/redmine/scm/adapters/cvs_adapter.rb
+++ b/lib/redmine/scm/adapters/cvs_adapter.rb
@@ -339,7 +339,7 @@ module Redmine
         # convert a date/time into the CVS-format
         def time_to_cvstime(time)
           return nil if time.nil?
-          time = Time.now if time == 'HEAD'
+          time = Time.now if (time.kind_of?(String) && time == 'HEAD')
 
           unless time.kind_of? Time
             time = Time.parse(time)