diff --git a/fuelweb_test/tests/tests_separate_services/test_separate_haproxy.py b/fuelweb_test/tests/tests_separate_services/test_separate_haproxy.py
index d5e53242c..a863c0cca 100644
--- a/fuelweb_test/tests/tests_separate_services/test_separate_haproxy.py
+++ b/fuelweb_test/tests/tests_separate_services/test_separate_haproxy.py
@@ -18,7 +18,10 @@ from proboscis import asserts
 from proboscis import test
 
 from fuelweb_test.helpers.decorators import log_snapshot_after_test
+from fuelweb_test.helpers.replace_repos import parse_ubuntu_repo
 from fuelweb_test.helpers import utils
+from fuelweb_test.settings import EXTRA_DEB_REPOS
+from fuelweb_test.settings import EXTRA_DEB_REPOS_PRIORITY
 from fuelweb_test.settings import NEUTRON
 from fuelweb_test.settings import NEUTRON_SEGMENT
 from fuelweb_test.settings import NODEGROUPS
@@ -107,14 +110,22 @@ class TestSeparateHaproxy(TestNetworkTemplatesBase):
             }
         )
         self.show_step(5)
-        if MIRROR_UBUNTU != '':
-            ubuntu_url = MIRROR_UBUNTU.split()[1]
-            replace_cmd = \
-                "sed -i 's,http://archive.ubuntu.com/ubuntu,{0},g'" \
-                " /usr/share/fuel-mirror/ubuntu.yaml".format(
-                    ubuntu_url)
-            self.ssh_manager.execute_on_remote(ip=admin_ip,
-                                               cmd=replace_cmd)
+        config_path = "/usr/share/fuel-mirror/ubuntu.yaml"
+        with utils.YamlEditor(config_path, ip=admin_ip) as editor:
+            if MIRROR_UBUNTU != '':
+                editor.content['ubuntu_baseurl'] = MIRROR_UBUNTU.split()[1]
+            if EXTRA_DEB_REPOS != '':
+                # replace mos-base-url to snapshot url from mos-proposed repo
+                for extra_deb_repo in EXTRA_DEB_REPOS.split('|'):
+                    parsed_repo = parse_ubuntu_repo(extra_deb_repo, None,
+                                                    EXTRA_DEB_REPOS_PRIORITY)
+                    if parsed_repo['name'] == 'mos-proposed':
+                        editor.content['mos_baseurl'] = parsed_repo['uri']
+
+                        # add proposed repository
+                        editor.content["groups"]["mos"].append(parsed_repo)
+                        editor.content["repos"].append(parsed_repo)
+
         create_mirror_cmd = 'fuel-mirror create -P ubuntu -G mos ubuntu'
         self.ssh_manager.execute_on_remote(ip=admin_ip, cmd=create_mirror_cmd)
         apply_mirror_cmd = 'fuel-mirror apply -P ubuntu -G mos ubuntu ' \