diff --git a/app/models/dmsf_file_revision.rb b/app/models/dmsf_file_revision.rb
index 869d89ec..df934983 100644
--- a/app/models/dmsf_file_revision.rb
+++ b/app/models/dmsf_file_revision.rb
@@ -68,7 +68,7 @@ class DmsfFileRevision < ActiveRecord::Base
   validates :title, :presence => true
   validates_format_of :name, :with => DmsfFolder::INVALID_CHARACTERS,
     :message => l(:error_contains_invalid_character)
-  validates :description, length: { maximum: 1.megabyte }
+  validates :description, length: { maximum: 1.kilobyte }
 
   def project
     self.dmsf_file.project if self.dmsf_file
diff --git a/test/unit/dmsf_file_revision_test.rb b/test/unit/dmsf_file_revision_test.rb
index 9f6ffe2c..578ce517 100644
--- a/test/unit/dmsf_file_revision_test.rb
+++ b/test/unit/dmsf_file_revision_test.rb
@@ -183,9 +183,9 @@ class DmsfFileRevisionTest < RedmineDmsf::Test::UnitTest
   end
 
   def test_description_max_length
-    @revision1.description = 'a' * 2.megabytes
+    @revision1.description = 'a' * 2.kilobytes
     assert !@revision1.save
-    @revision1.description = 'a' * 1.megabyte
+    @revision1.description = 'a' * 1.kilobyte
     assert @revision1.save
   end