diff --git a/pubtools/_pulp/services/cdn.py b/pubtools/_pulp/services/cdn.py
index f5fc947d..64c30c3e 100644
--- a/pubtools/_pulp/services/cdn.py
+++ b/pubtools/_pulp/services/cdn.py
@@ -45,6 +45,13 @@ def add_service_args(self, parser):
             "--cdn-arl-template",
             help="ARL template used for flushing cache by ARL",
             nargs="*",
+            # FIXME: combination of nargs='*' and action='append' will
+            # generate a list of lists, but we just want one flat list.
+            # We flatten this elsewhere.
+            #
+            # When minimum python is >= 3.8, replace this with action="extend"
+            action="append",
+            default=[],
         )
 
     @property
@@ -61,6 +68,11 @@ def cdn_client(self):
 
     def __get_instance(self):
         args = self._service_args
+
+        # FIXME: see above comment about action="extend" for python >= 3.8
+        # This flattens the list-of-list.
+        args.cdn_arl_template = [x for y in args.cdn_arl_template for x in y]
+
         if not args.cdn_url:
             # disable requests made to CDN
             return None
diff --git a/tests/logs/publish/test_publish/test_repo_publish_cache_cleanup_with_arl.txt b/tests/logs/publish/test_publish/test_repo_publish_cache_cleanup_with_arl.txt
index 6f49566a..f4949a85 100644
--- a/tests/logs/publish/test_publish/test_repo_publish_cache_cleanup_with_arl.txt
+++ b/tests/logs/publish/test_publish/test_repo_publish_cache_cleanup_with_arl.txt
@@ -5,6 +5,10 @@
 [    INFO] Publish: finished
 [    INFO] Flush CDN cache: started
 [    INFO] Flushing cache for repo1:
+[    INFO]    /bar/fake-ttl/content/unit/1/client/mutable1
+[    INFO]    /bar/fake-ttl/content/unit/1/client/mutable2
+[    INFO]    /baz/fake-ttl/content/unit/1/client/mutable1
+[    INFO]    /baz/fake-ttl/content/unit/1/client/mutable2
 [    INFO]    /foo/fake-ttl/content/unit/1/client/mutable1
 [    INFO]    /foo/fake-ttl/content/unit/1/client/mutable2
 [    INFO]    https://cdn.example.com/content/unit/1/client/mutable1
diff --git a/tests/publish/test_publish.py b/tests/publish/test_publish.py
index dc3fc26a..509d5456 100644
--- a/tests/publish/test_publish.py
+++ b/tests/publish/test_publish.py
@@ -268,6 +268,9 @@ def test_repo_publish_cache_cleanup_with_arl(command_tester):
                 "https://cdn.example.com/",
                 "--cdn-arl-template",
                 "/foo/{ttl}/{path}",
+                "--cdn-arl-template",
+                "/bar/{ttl}/{path}",
+                "/baz/{ttl}/{path}",
                 "--cdn-cert",
                 "/some/path/to/cert",
                 "--cdn-key",
@@ -279,6 +282,10 @@ def test_repo_publish_cache_cleanup_with_arl(command_tester):
     assert [hist.repository.id for hist in fake_pulp.publish_history] == ["repo1"]
     # flushed the urls and the arls
     assert sorted(fake_publish.fastpurge_client.purged_urls) == [
+        "/bar/fake-ttl/content/unit/1/client/mutable1",
+        "/bar/fake-ttl/content/unit/1/client/mutable2",
+        "/baz/fake-ttl/content/unit/1/client/mutable1",
+        "/baz/fake-ttl/content/unit/1/client/mutable2",
         "/foo/fake-ttl/content/unit/1/client/mutable1",
         "/foo/fake-ttl/content/unit/1/client/mutable2",
         "https://cdn.example.com/content/unit/1/client/mutable1",