diff --git a/services/web/scripts/check_institution_users.js b/services/web/scripts/check_institution_users.js
index 56d9b21386..44451f2eb0 100644
--- a/services/web/scripts/check_institution_users.js
+++ b/services/web/scripts/check_institution_users.js
@@ -1,3 +1,7 @@
+// Run all the mongo queries on secondaries
+process.env.MONGO_CONNECTION_STRING =
+  process.env.READ_ONLY_MONGO_CONNECTION_STRING
+
 const { waitForDb } = require('../app/src/infrastructure/mongodb')
 const InstitutionsManager = require('../app/src/Features/Institutions/InstitutionsManager')