diff --git a/bin/pungi-config-validate b/bin/pungi-config-validate
index 597222af..815d14fe 100755
--- a/bin/pungi-config-validate
+++ b/bin/pungi-config-validate
@@ -103,7 +103,7 @@ def run(config, topdir, has_old):
         pungi.phases.GatherPhase(compose, pkgset_phase),
         pungi.phases.ExtraFilesPhase(compose, pkgset_phase),
         pungi.phases.CreaterepoPhase(compose),
-        pungi.phases.OstreeInstallerPhase(compose),
+        pungi.phases.OstreeInstallerPhase(compose, buildinstall_phase),
         pungi.phases.OSTreePhase(compose),
         pungi.phases.ProductimgPhase(compose, pkgset_phase),
         pungi.phases.CreateisoPhase(compose, buildinstall_phase),
diff --git a/bin/pungi-koji b/bin/pungi-koji
index 00ab6064..75b7fc6b 100755
--- a/bin/pungi-koji
+++ b/bin/pungi-koji
@@ -290,7 +290,7 @@ def run_compose(compose, create_latest_link=True, latest_link_status=None):
     gather_phase = pungi.phases.GatherPhase(compose, pkgset_phase)
     extrafiles_phase = pungi.phases.ExtraFilesPhase(compose, pkgset_phase)
     createrepo_phase = pungi.phases.CreaterepoPhase(compose)
-    ostree_installer_phase = pungi.phases.OstreeInstallerPhase(compose)
+    ostree_installer_phase = pungi.phases.OstreeInstallerPhase(compose, buildinstall_phase)
     ostree_phase = pungi.phases.OSTreePhase(compose)
     productimg_phase = pungi.phases.ProductimgPhase(compose, pkgset_phase)
     createiso_phase = pungi.phases.CreateisoPhase(compose, buildinstall_phase)
diff --git a/pungi/phases/ostree_installer.py b/pungi/phases/ostree_installer.py
index 190e3fe4..adf5bc9f 100644
--- a/pungi/phases/ostree_installer.py
+++ b/pungi/phases/ostree_installer.py
@@ -16,9 +16,10 @@ from ..wrappers import kojiwrapper, iso, lorax, scm
 class OstreeInstallerPhase(PhaseLoggerMixin, ConfigGuardedPhase):
     name = 'ostree_installer'
 
-    def __init__(self, compose):
+    def __init__(self, compose, buildinstall_phase):
         super(OstreeInstallerPhase, self).__init__(compose)
         self.pool = ThreadPool(logger=self.logger)
+        self.bi = buildinstall_phase
 
     def validate(self):
         errors = []
@@ -27,14 +28,15 @@ class OstreeInstallerPhase(PhaseLoggerMixin, ConfigGuardedPhase):
         except ValueError as exc:
             errors = exc.message.split('\n')
 
-        for variant in self.compose.get_variants():
-            for arch in variant.arches:
-                conf = util.get_arch_variant_data(self.compose.conf, self.name,
-                                                  arch, variant)
-                if conf and not variant.is_empty:
-                    errors.append('Can not generate ostree installer for %s.%s: '
-                                  'it has buildinstall running already and the '
-                                  'files would clash.' % (variant.uid, arch))
+        if 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,
+                                                      arch, variant)
+                    if conf and not variant.is_empty:
+                        errors.append('Can not generate ostree installer for %s.%s: '
+                                      'it has buildinstall running already and the '
+                                      'files would clash.' % (variant.uid, arch))
 
         if errors:
             raise ValueError('\n'.join(errors))
diff --git a/tests/test_ostree_installer_phase.py b/tests/test_ostree_installer_phase.py
index e9b58006..cc0fbdf8 100644
--- a/tests/test_ostree_installer_phase.py
+++ b/tests/test_ostree_installer_phase.py
@@ -33,7 +33,7 @@ class OstreeInstallerPhaseTest(helpers.PungiTestCase):
 
         pool = ThreadPool.return_value
 
-        phase = ostree.OstreeInstallerPhase(compose)
+        phase = ostree.OstreeInstallerPhase(compose, mock.Mock())
         phase.run()
 
         self.assertEqual(len(pool.add.call_args_list), 1)
@@ -45,9 +45,35 @@ class OstreeInstallerPhaseTest(helpers.PungiTestCase):
         compose = helpers.DummyCompose(self.topdir, {})
         compose.just_phases = None
         compose.skip_phases = []
-        phase = ostree.OstreeInstallerPhase(compose)
+        phase = ostree.OstreeInstallerPhase(compose, mock.Mock())
         self.assertTrue(phase.skip())
 
+    def test_validate_conflict_with_buildinstall(self):
+        compose = helpers.DummyCompose(self.topdir, {
+            'ostree_installer': [
+                ('^Server$', {'x86_64': mock.Mock()})
+            ],
+        })
+
+        phase = ostree.OstreeInstallerPhase(compose, mock.Mock(_skipped=False))
+        with self.assertRaises(ValueError) as ctx:
+            phase.validate()
+
+        self.assertEqual(str(ctx.exception),
+                         'Can not generate ostree installer for Server.x86_64:'
+                         ' it has buildinstall running already and the files'
+                         ' would clash.')
+
+    def test_validate_buildinstall_skipped(self):
+        compose = helpers.DummyCompose(self.topdir, {
+            'ostree_installer': [
+                ('^Server$', {'x86_64': mock.Mock()})
+            ],
+        })
+
+        phase = ostree.OstreeInstallerPhase(compose, mock.Mock(_skipped=True))
+        phase.validate()
+
 
 class OstreeThreadTest(helpers.PungiTestCase):