diff --git a/test/CDB_FederatedServerDiagnostics.sql b/test/CDB_FederatedServerDiagnostics.sql
index e3b880c..ef0dbf1 100644
--- a/test/CDB_FederatedServerDiagnostics.sql
+++ b/test/CDB_FederatedServerDiagnostics.sql
@@ -46,6 +46,14 @@ SELECT '1.3', cartodb.CDB_Federated_Server_Diagnostics(server => 'loopback') @>
 SELECT '1.4', cartodb.CDB_Federated_Server_Diagnostics(server => 'loopback') @> format('{"postgis_version": "%s"}', extversion)::jsonb
     FROM pg_extension WHERE extname = 'postgis';
 
+\echo '%% It returns null as the postgis version if it is not installed'
+\set QUIET on
+\c cdb_fs_tester postgres
+DROP EXTENSION postgis;
+\c contrib_regression postgres
+\set QUIET off
+SELECT '1.5', cartodb.CDB_Federated_Server_Diagnostics(server => 'loopback') @> '{"postgis_version": null}'::jsonb;
+
 
 -- ===================================================================
 -- Cleanup
diff --git a/test/CDB_FederatedServerDiagnostics_expect b/test/CDB_FederatedServerDiagnostics_expect
index 1c58eda..bff416f 100644
--- a/test/CDB_FederatedServerDiagnostics_expect
+++ b/test/CDB_FederatedServerDiagnostics_expect
@@ -7,4 +7,6 @@ ERROR:  Server "doesNotExist" does not exist
 1.3|t
 %% It returns the postgis version
 1.4|t
+%% It returns null as the postgis version if it is not installed
+1.5|t
 D1|