diff --git a/app/services/process_interaction_service.rb b/app/services/process_interaction_service.rb
index c00f8c66a..fd27d667f 100644
--- a/app/services/process_interaction_service.rb
+++ b/app/services/process_interaction_service.rb
@@ -77,7 +77,7 @@ class ProcessInteractionService < BaseService
   end
 
   def activity_id(xml)
-    xml.at_xpath('/xmlns:entry/xmlns:id').content
+    xml.at_xpath('./activity:object/xmlns:id').content
   end
 
   def salmon