diff --git a/Kitodo/src/main/java/org/kitodo/production/services/data/base/SearchService.java b/Kitodo/src/main/java/org/kitodo/production/services/data/base/SearchService.java
index 3c53b925253..58fb0094dd0 100644
--- a/Kitodo/src/main/java/org/kitodo/production/services/data/base/SearchService.java
+++ b/Kitodo/src/main/java/org/kitodo/production/services/data/base/SearchService.java
@@ -857,7 +857,7 @@ protected List<String> findDistinctValues(QueryBuilder query, String field, bool
         List<String> distinctValues = new ArrayList<>();
         try {
             TermsAggregationBuilder termsAggregation = AggregationBuilders.terms(field).field(field)
-                    .order(BucketOrder.aggregation("_term", sort));
+                    .order(BucketOrder.aggregation("_key", sort));
             if (size > 0) {
                 termsAggregation.size(Math.toIntExact(size));
             }