diff --git a/services/web/migrations/20220105130000_fix_saml_indexes.js b/services/web/migrations/20220105130000_fix_saml_indexes.js
index 263061fdcb..cb5bfb5b5d 100644
--- a/services/web/migrations/20220105130000_fix_saml_indexes.js
+++ b/services/web/migrations/20220105130000_fix_saml_indexes.js
@@ -7,7 +7,12 @@ exports.tags = ['saas']
 exports.migrate = async ({ db }) => {
   // Fix-up the previous SAML migrations that were operating on collections with
   //  typos in their names.
-  await Helpers.addIndexesToCollection(db.users, usersIndexes)
+  await Helpers.addIndexesToCollection(
+    db.users,
+    usersIndexes.map(index => {
+      return Object.assign({}, index, { unique: true })
+    })
+  )
   await Helpers.addIndexesToCollection(db.samlLogs, samlLogsIndexes)
 }