diff --git a/github-bot/src/main/java/io/github/martinwitt/laughing_train/persistence/DataBaseMigration.java b/github-bot/src/main/java/io/github/martinwitt/laughing_train/persistence/DataBaseMigration.java
index bb0bbcd4a..52bac9614 100644
--- a/github-bot/src/main/java/io/github/martinwitt/laughing_train/persistence/DataBaseMigration.java
+++ b/github-bot/src/main/java/io/github/martinwitt/laughing_train/persistence/DataBaseMigration.java
@@ -97,6 +97,9 @@ public void createIndexes() {
                     .createIndex(
                             BsonDocument.parse("{commitHash: 1, ruleID: 1}"),
                             new IndexOptions().name("commitHash_ruleID_idx"));
+            badSmellRepositoryImpl
+                    .mongoCollection()
+                    .createIndex(BsonDocument.parse("{identifier: 1}"), new IndexOptions().name("identifier_idx"));
         } catch (Exception e) {
 
             logger.atSevere().withCause(e).log("Error while creating indexes");