diff --git a/doc/configuration.rst b/doc/configuration.rst
index 88ccab21..d28ffdca 100644
--- a/doc/configuration.rst
+++ b/doc/configuration.rst
@@ -1341,6 +1341,15 @@ an OSTree repository. This always runs in Koji as a ``runroot`` task.
     ``template_repo`` needs to point to a Git repository from which to take the
     templates.
 
+**ostree_installer_overwrite** = False
+    (*bool*) -- by default if a variant including OSTree installer also creates
+    regular installer images in buildinstall phase, there will be conflicts (as
+    the files are put in the same place) and Pungi will report an error and
+    fail the compose.
+
+    With this option it is possible to opt-in for the overwriting. The
+    traditional ``boot.iso`` will be in the ``iso/`` subdirectory.
+
 
 Example config
 --------------
diff --git a/pungi/checks.py b/pungi/checks.py
index d84f24ad..a7905e03 100644
--- a/pungi/checks.py
+++ b/pungi/checks.py
@@ -968,6 +968,11 @@ def make_schema():
                 "additionalProperties": False,
             }),
 
+            "ostree_installer_overwrite": {
+                "type": "boolean",
+                "default": False,
+            },
+
             "live_images": _variant_arch_mapping(
                 _one_or_list({"$ref": "#/definitions/live_image_config"})
             ),
diff --git a/pungi/phases/ostree_installer.py b/pungi/phases/ostree_installer.py
index adf5bc9f..79f337ef 100644
--- a/pungi/phases/ostree_installer.py
+++ b/pungi/phases/ostree_installer.py
@@ -28,7 +28,7 @@ class OstreeInstallerPhase(PhaseLoggerMixin, ConfigGuardedPhase):
         except ValueError as exc:
             errors = exc.message.split('\n')
 
-        if not self.bi._skipped:
+        if not self.compose.conf['ostree_installer_overwrite'] and not self.bi._skipped:
             for variant in self.compose.get_variants():
                 for arch in variant.arches:
                     conf = util.get_arch_variant_data(self.compose.conf, self.name,
diff --git a/tests/test_ostree_installer_phase.py b/tests/test_ostree_installer_phase.py
index cc0fbdf8..23c685ce 100644
--- a/tests/test_ostree_installer_phase.py
+++ b/tests/test_ostree_installer_phase.py
@@ -74,6 +74,17 @@ class OstreeInstallerPhaseTest(helpers.PungiTestCase):
         phase = ostree.OstreeInstallerPhase(compose, mock.Mock(_skipped=True))
         phase.validate()
 
+    def test_validate_overwrite_enabled(self):
+        compose = helpers.DummyCompose(self.topdir, {
+            'ostree_installer_overwrite': True,
+            'ostree_installer': [
+                ('^Server$', {'x86_64': mock.Mock()})
+            ],
+        })
+
+        phase = ostree.OstreeInstallerPhase(compose, mock.Mock(_skipped=False))
+        phase.validate()
+
 
 class OstreeThreadTest(helpers.PungiTestCase):