diff --git a/tests/unit_tests/config/test_ert_config.py b/tests/unit_tests/config/test_ert_config.py
index 2ab015a35a5..fe8acebe0db 100644
--- a/tests/unit_tests/config/test_ert_config.py
+++ b/tests/unit_tests/config/test_ert_config.py
@@ -12,7 +12,7 @@
 import pytest
 from hypothesis import assume, given, settings
 from hypothesis import strategies as st
-from pydantic import RootModel, ValidationError
+from pydantic import RootModel, TypeAdapter, ValidationError
 
 from ert.config import AnalysisConfig, ConfigValidationError, ErtConfig, HookRuntime
 from ert.config.ert_config import site_config_location
@@ -534,6 +534,9 @@ def test_that_ert_config_is_serializable(tmp_path_factory, config_generator):
         assert from_json == ert_config
 
 
+def test_that_ert_config_has_valid_schema():
+    TypeAdapter.json_schema(ErtConfig)
+
 @pytest.mark.filterwarnings("ignore::ert.config.ConfigWarning")
 @pytest.mark.usefixtures("set_site_config")
 @settings(max_examples=10)