diff --git a/meta-test/recipes-app/test-variants/files/control b/meta-test/recipes-app/test-variants/files/control
new file mode 100644
index 00000000..b171c7e7
--- /dev/null
+++ b/meta-test/recipes-app/test-variants/files/control
@@ -0,0 +1,18 @@
+Source: test-variants
+Section: misc
+Priority: optional
+Maintainer: isar-users <isar-users@googlegroups.com>
+Build-Depends: debhelper-compat (= 10),
+Standards-Version: 4.1.3
+
+Package: test-variants
+Architecture: any
+Build-Profiles: <pkg.test-variants.base>
+Description: Binary package of the base recipe
+ Built by the base recipe only.
+
+Package: test-variants-extra
+Architecture: any
+Build-Profiles: <pkg.test-variants.extra>
+Description: Binary package of the -kbuildtarget variant
+ Built by the -kbuildtarget variant only.
diff --git a/meta-test/recipes-app/test-variants/test-variants.bb b/meta-test/recipes-app/test-variants/test-variants.bb
new file mode 100644
index 00000000..19382807
--- /dev/null
+++ b/meta-test/recipes-app/test-variants/test-variants.bb
@@ -0,0 +1,25 @@
+# This software is a part of Isar.
+# Copyright (C) 2026 Siemens AG
+#
+# SPDX-License-Identifier: MIT
+#
+# test package built in two variants that share one source package name and
+# one architecture, as the kernel recipes do via kbuildtarget.bbclass. Each
+# variant produces a differently named binary package, so a cleanup that keys
+# on the source package instead of the recipe is visible in isar-apt.
+DPKG_ARCH = "any"
+SRC_URI = "file://control"
+
+MAINTAINER = "isar-users <isar-users@googlegroups.com>"
+
+inherit dpkg-raw
+inherit kbuildtarget
+
+BBCLASSEXTEND = "kbuildtarget"
+
+DEB_BUILD_PROFILES = "pkg.${BPN}.base"
+DEB_BUILD_PROFILES:class-kbuildtarget = "pkg.${BPN}.extra"
+
+do_prepare_build:append() {
+    cp ${WORKDIR}/control ${S}/debian/
+}
diff --git a/testsuite/cibase.py b/testsuite/cibase.py
index 2cf8448b..e5150b36 100755
--- a/testsuite/cibase.py
+++ b/testsuite/cibase.py
@@ -115,6 +115,19 @@ class CIBaseTest(CIBuilder):
         with open(config_filename, 'w') as f:
             yaml.dump(cfg, f)
 
+    def isar_apt_packages(self, distro):
+        """Names of the binary packages currently registered in isar-apt."""
+        self.check_init()
+        pattern = os.path.join(self.build_dir, 'tmp', 'deploy', 'isar-apt',
+                               distro, '**', 'Packages')
+        packages = set()
+        for index in glob.glob(pattern, recursive=True):
+            with open(index) as f:
+                for line in f:
+                    if line.startswith('Package:'):
+                        packages.add(line.split(':', 1)[1].strip())
+        return packages
+
     def perform_wic_partition_test(self, targets, wic_deploy_parts, **kwargs):
         lines = kwargs.get('lines', [])
         lines += [
diff --git a/testsuite/citest.py b/testsuite/citest.py
index dfb6eaa2..0cedcc2c 100644
--- a/testsuite/citest.py
+++ b/testsuite/citest.py
@@ -194,6 +194,26 @@ class RepositoryTest(CIBaseTest):
                                 bitbake_cmd='do_rootfs_install',
                                 )
 
+    def test_repository_shared_source(self):
+        """
+        Test that recipe variants sharing a source package and an
+        architecture keep each other's binary packages in isar-apt.
+        """
+        targets = [
+            'mc:qemuamd64-trixie:test-variants',
+            'mc:qemuamd64-trixie:test-variants-kbuildtarget',
+        ]
+
+        self.init()
+        self.delete_from_build_dir('tmp')
+        self.perform_build_test(targets)
+
+        distro = CIUtils.getVars('DISTRO', target=targets[0])
+        packages = self.isar_apt_packages(distro)
+        for package in ('test-variants', 'test-variants-extra'):
+            self.assertIn(package, packages,
+                          f"{package} is missing from isar-apt")
+
 
 class SbuildFlavor(CIBaseTest):
     """