diff --git a/src/metabase/api/geojson.clj b/src/metabase/api/geojson.clj
index 1f96aee01f54249bd5ef59a88cc22a69ba9c0316..472234cca155b9766fbd0c1a0c727ee21faf3c1b 100644
--- a/src/metabase/api/geojson.clj
+++ b/src/metabase/api/geojson.clj
@@ -38,10 +38,11 @@
                  (throw (Exception. (str "Invalid JSON URL or resource: " url-or-resource-path)))))))
 
 (def ^:private CustomGeoJSON
-  {s/Keyword {:name        s/Str
-              :url         (s/constrained s/Str valid-json-url-or-resource? "URL must point to a valid JSON file.")
-              :region_key  (s/maybe s/Str)
-              :region_name (s/maybe s/Str)}})
+  {s/Keyword {:name                     s/Str
+              :url                      (s/constrained s/Str valid-json-url-or-resource? "URL must point to a valid JSON file.")
+              :region_key               (s/maybe s/Str)
+              :region_name              (s/maybe s/Str)
+              (s/optional-key :builtin) s/Bool}})
 
 (def ^:private builtin-geojson
   {:us_states {:name "United States" :url "/app/charts/us-states.json" :region_key "name" :region_name "name" :builtin true}
diff --git a/test/metabase/api/geojson_test.clj b/test/metabase/api/geojson_test.clj
index b2e0a3f4bf69310c42ff3022701bd1d2062c5db6..bdf0fce9c8c1655507e606f4609294c110f817bd 100644
--- a/test/metabase/api/geojson_test.clj
+++ b/test/metabase/api/geojson_test.clj
@@ -14,10 +14,20 @@
   "https://raw.githubusercontent.com/metabase/metabase/master/test_resources/test.geojson")
 
 (def ^:private ^:const test-custom-geojson
-  {:middle-earth {:name        "Middle Earth"
-                  :url         test-geojson-url
-                  :region_key  nil
-                  :region_name nil}})
+  {:middle-earth    {:name        "Middle Earth"
+                     :url         test-geojson-url
+                     :region_key  nil
+                     :region_name nil}
+   :us_states       {:name "United States"
+                     :url "/app/charts/us-states.json"
+                     :region_key "name"
+                     :region_name "name"
+                     :builtin true}
+   :world_countries {:name "World"
+                     :url "/app/charts/world.json"
+                     :region_key "ISO_A2"
+                     :region_name "NAME"
+                     :builtin true}})
 
 
 ;;; test valid-json-url?