diff --git a/rest-api-spec/src/main/resources/rest-api-spec/test/search/190_index_prefix_search.yml b/rest-api-spec/src/main/resources/rest-api-spec/test/search/190_index_prefix_search.yml
index ca8e89aa2d5b5..4532a26451c05 100644
--- a/rest-api-spec/src/main/resources/rest-api-spec/test/search/190_index_prefix_search.yml
+++ b/rest-api-spec/src/main/resources/rest-api-spec/test/search/190_index_prefix_search.yml
@@ -84,6 +84,9 @@ setup:
 
 ---
 "search with uppercase regex":
+  - skip:
+      version: " - 2.3.99"
+      reason: uppercase regex not supported before 2.4.0
   - do:
       search:
         rest_total_hits_as_int: true