diff --git a/pungi/phases/gather/methods/method_deps.py b/pungi/phases/gather/methods/method_deps.py
index 44fb60b2..e82c9070 100644
--- a/pungi/phases/gather/methods/method_deps.py
+++ b/pungi/phases/gather/methods/method_deps.py
@@ -68,15 +68,17 @@ def raise_on_invalid_sigkeys(arch, variant, package_sets, result):
 
 def _format_packages(pkgs):
     """Sort packages and merge name with arch."""
-    for pkg, pkg_arch in sorted(pkgs):
+    result = set()
+    for pkg, pkg_arch in pkgs:
         if type(pkg) in [SimpleRpmWrapper, RpmWrapper]:
             pkg_name = pkg.name
         else:
             pkg_name = pkg
         if pkg_arch:
-            yield '%s.%s' % (pkg_name, pkg_arch)
+            result.add("%s.%s" % (pkg_name, pkg_arch))
         else:
-            yield pkg_name
+            result.add(pkg_name)
+    return sorted(result)
 
 
 def write_pungi_config(compose, arch, variant, packages, groups, filter_packages,
diff --git a/tests/test_gather_method_deps.py b/tests/test_gather_method_deps.py
index 1d577209..85a24a47 100644
--- a/tests/test_gather_method_deps.py
+++ b/tests/test_gather_method_deps.py
@@ -41,6 +41,27 @@ class TestWritePungiConfig(helpers.PungiTestCase):
                            exclude_packages=['pkg3', 'pkg4.x86_64'],
                            fulltree_excludes=fulltree, package_whitelist=set())
 
+    @mock.patch("pungi.phases.gather.methods.method_deps.PungiWrapper")
+    def test_duplicated_package_name(self, PungiWrapper):
+        pkgs = [("pkg1", None), ("pkg1", "x86_64")]
+        grps = []
+        filter = [("pkg2", None), ("pkg2", "x86_64")]
+        white = mock.Mock()
+        black = mock.Mock()
+        prepopulate = mock.Mock()
+        fulltree = mock.Mock()
+        deps.write_pungi_config(self.compose, "x86_64", self.compose.variants["Server"],
+                                pkgs, grps, filter, white, black,
+                                prepopulate=prepopulate, fulltree_excludes=fulltree)
+        self.assertWritten(PungiWrapper, packages=["pkg1", "pkg1.x86_64"],
+                           ks_path=self.topdir + "/work/x86_64/pungi/Server.x86_64.conf",
+                           lookaside_repos={}, multilib_whitelist=white, multilib_blacklist=black,
+                           groups=[], prepopulate=prepopulate,
+                           repos={"pungi-repo": self.topdir + "/work/x86_64/repo",
+                                  "comps-repo": self.topdir + "/work/x86_64/comps_repo_Server"},
+                           exclude_packages=["pkg2", "pkg2.x86_64"],
+                           fulltree_excludes=fulltree, package_whitelist=set())
+
     @mock.patch('pungi.phases.gather.get_lookaside_repos')
     @mock.patch('pungi.phases.gather.methods.method_deps.PungiWrapper')
     def test_with_lookaside(self, PungiWrapper, glr):