diff --git a/app/models/merge_request.rb b/app/models/merge_request.rb
index 4cbdc6122971c75879e9373db5d9c515b0f790c7..798306f6dcc83272d79646c2fc2d82e04b09109d 100644
--- a/app/models/merge_request.rb
+++ b/app/models/merge_request.rb
@@ -95,11 +95,11 @@ class MergeRequest < ActiveRecord::Base
     end
 
     event :mark_as_mergeable do
-      transition unchecked: :can_be_merged
+      transition [:unchecked, :cannot_be_merged] => :can_be_merged
     end
 
     event :mark_as_unmergeable do
-      transition unchecked: :cannot_be_merged
+      transition [:unchecked, :can_be_merged] => :cannot_be_merged
     end
 
     state :unchecked