diff --git a/300_Aggregations/20_basic_example.asciidoc b/300_Aggregations/20_basic_example.asciidoc
index 2c3281000..c3b9cdcec 100644
--- a/300_Aggregations/20_basic_example.asciidoc
+++ b/300_Aggregations/20_basic_example.asciidoc
@@ -52,7 +52,7 @@ GET /cars/transactions/_search
     "aggs" : { <1>
         "popular_colors" : { <2>
             "terms" : { <3>
-              "field" : "color"
+              "field" : "color.keyword"
             }
         }
     }