diff --git a/pungi/checks.py b/pungi/checks.py
index 1b3336ac..3112170c 100644
--- a/pungi/checks.py
+++ b/pungi/checks.py
@@ -1463,6 +1463,7 @@ def make_schema():
                                     "additionalProperties": True,
                                 },
                                 "seed": {"type": "integer"},
+                                "manifest_type": {"type": "string"},
                             },
                             "required": [
                                 "name",
diff --git a/tests/test_imagebuilderphase.py b/tests/test_imagebuilderphase.py
index 57ede26a..c1bd1478 100644
--- a/tests/test_imagebuilderphase.py
+++ b/tests/test_imagebuilderphase.py
@@ -61,6 +61,7 @@ class TestImageBuilderPhase(PungiTestCase):
                 "repos": ["https://example.com/repo/", "Client"],
                 "types": ["custom"],
                 "version": "Rawhide",
+                "manifest_type": "custom-type",
             },
         )
         compose = DummyCompose(self.topdir, {"imagebuilder": {"^Server$": [cfg]}})