diff --git a/src/ElasticSearch/Facet/Type/KeywordFacet.php b/src/ElasticSearch/Facet/Type/KeywordFacet.php
index ffc1aacab801ce376f4c9a3e8d459c9775d1a87f..b525e51530dce6c38dccde88177be4ed1529516b 100644
--- a/src/ElasticSearch/Facet/Type/KeywordFacet.php
+++ b/src/ElasticSearch/Facet/Type/KeywordFacet.php
@@ -11,9 +11,13 @@ final class KeywordFacet extends Facet
      */
     public function es(): array
     {
+        $value = is_array($this->value) ?
+            array_map(static fn($value) => (string) $value, $this->value) :
+            (string) $this->value;
+
         return [
             'facet_code' => $this->property->getKey(),
-            'facet_value' => (string) $this->value,
+            'facet_value' => $value
         ];
     }
 }