diff --git a/lib/ext/rosa/constraints.rb b/lib/ext/rosa/constraints.rb
index 5220c8f02..8d4aa4340 100644
--- a/lib/ext/rosa/constraints.rb
+++ b/lib/ext/rosa/constraints.rb
@@ -22,7 +22,7 @@ module Rosa
       def self.matches?(request)
         if (params = request.path_parameters) && params[:treeish] # parse existing branch (tag) and path
           branch_or_tag = begin
-            (p = Project.find_by_owner_and_name params[:owner_and_name]) &&
+            (p = Project.find_by_owner_and_name params[:name_with_owner]) &&
             p.repo.branches_and_tags.map(&:name).sort{|a,b| b.length <=> a.length}.detect{|b| params[:treeish].start_with?(b)} ||
             params[:treeish].split('/').first
           end