diff --git a/db/migrate/060_change_changesets_committer_limit.rb b/db/migrate/060_change_changesets_committer_limit.rb
index 5cc2f0d1d..b05096379 100644
--- a/db/migrate/060_change_changesets_committer_limit.rb
+++ b/db/migrate/060_change_changesets_committer_limit.rb
@@ -1,6 +1,6 @@
 class ChangeChangesetsCommitterLimit < ActiveRecord::Migration
   def self.up
-    change_column :changesets, :committer, :string
+    change_column :changesets, :committer, :string, :limit => nil
   end
 
   def self.down
diff --git a/db/migrate/070_change_attachments_content_type_limit.rb b/db/migrate/070_change_attachments_content_type_limit.rb
index e3dfacc3c..ebf6d08c3 100644
--- a/db/migrate/070_change_attachments_content_type_limit.rb
+++ b/db/migrate/070_change_attachments_content_type_limit.rb
@@ -1,6 +1,6 @@
 class ChangeAttachmentsContentTypeLimit < ActiveRecord::Migration
   def self.up
-    change_column :attachments, :content_type, :string
+    change_column :attachments, :content_type, :string, :limit => nil
   end
 
   def self.down
diff --git a/db/migrate/084_change_auth_sources_account_limit.rb b/db/migrate/084_change_auth_sources_account_limit.rb
index 6a933b894..cc127b439 100644
--- a/db/migrate/084_change_auth_sources_account_limit.rb
+++ b/db/migrate/084_change_auth_sources_account_limit.rb
@@ -1,6 +1,6 @@
 class ChangeAuthSourcesAccountLimit < ActiveRecord::Migration
   def self.up
-    change_column :auth_sources, :account, :string
+    change_column :auth_sources, :account, :string, :limit => nil
   end
 
   def self.down