diff --git a/app/serializers/build_details_entity.rb b/app/serializers/build_details_entity.rb
index 8ad5af1987c..743a08acefe 100644
--- a/app/serializers/build_details_entity.rb
+++ b/app/serializers/build_details_entity.rb
@@ -16,7 +16,8 @@ class BuildDetailsEntity < JobEntity
     end
 
     expose :path do |build|
-      project_merge_request_path(build.project, build.merge_request)
+      project_merge_request_path(build.merge_request.project,
+                                 build.merge_request)
     end
   end
 
diff --git a/spec/serializers/build_details_entity_spec.rb b/spec/serializers/build_details_entity_spec.rb
index 446a2451956..1332572fffc 100644
--- a/spec/serializers/build_details_entity_spec.rb
+++ b/spec/serializers/build_details_entity_spec.rb
@@ -81,9 +81,9 @@ describe BuildDetailsEntity do
           expect(subject[:merge_request][:iid]).to eq merge_request.iid
         end
 
-        it 'has a correct merge request path' do
+        it 'has a merge request path to a target project' do
           expect(subject[:merge_request][:path])
-            .to include fork_project.full_path
+            .to include project.full_path
         end
       end