diff --git a/scripts/trigger-build b/scripts/trigger-build
index 4534fcadebf..285f810c3c0 100755
--- a/scripts/trigger-build
+++ b/scripts/trigger-build
@@ -69,6 +69,7 @@ module Trigger
     def base_variables
       {
         'TOP_UPSTREAM_TRIGGER_PROJECT' => ENV['TOP_UPSTREAM_TRIGGER_PROJECT'] || ENV['CI_PROJECT_PATH'],
+        'TOP_UPSTREAM_SOURCE_SHA' => ENV['CI_COMMIT_SHA'],
         'UPSTREAM_TRIGGER_PROJECT' => ENV['CI_PROJECT_PATH'],
         'UPSTREAM_TRIGGER_SOURCE' => ENV['TRIGGER_SOURCE'],
         'TRIGGERED_USER' => ENV['TRIGGERED_USER'] || ENV['GITLAB_USER_NAME'],