diff --git a/types/algoliasearch/index.d.ts b/types/algoliasearch/index.d.ts
index 2baf12c0e8..e799ee1832 100644
--- a/types/algoliasearch/index.d.ts
+++ b/types/algoliasearch/index.d.ts
@@ -1455,7 +1455,7 @@ declare namespace algoliasearch {
     /**
      * https://www.algolia.com/doc/api-reference/api-parameters/sortFacetValuesBy/
      */
-    sortFacetValuesBy: 'count' | 'alpha';
+    sortFacetValuesBy?: "count"|"alpha";
   }
 
   namespace SearchForFacetValues {
diff --git a/types/algoliasearch/lite/index.d.ts b/types/algoliasearch/lite/index.d.ts
index 3617ae91a0..a3babc339b 100644
--- a/types/algoliasearch/lite/index.d.ts
+++ b/types/algoliasearch/lite/index.d.ts
@@ -535,7 +535,7 @@ declare namespace algoliasearch {
     /**
      * https://www.algolia.com/doc/api-reference/api-parameters/sortFacetValuesBy/
      */
-    sortFacetValuesBy: 'count' | 'alpha';
+    sortFacetValuesBy?: "count"|"alpha";
   }
 
   namespace SearchForFacetValues {