diff --git a/gitlab/tests/test_types.py b/gitlab/tests/test_types.py
index 5b9f2caf8..3613383de 100644
--- a/gitlab/tests/test_types.py
+++ b/gitlab/tests/test_types.py
@@ -51,11 +51,19 @@ def test_empty_input(self):
         o.set_from_cli("  ")
         self.assertEqual([], o.get())
 
-    def test_get_for_api(self):
+    def test_get_for_api_from_cli(self):
         o = types.ListAttribute()
         o.set_from_cli("foo,bar,baz")
         self.assertEqual("foo,bar,baz", o.get_for_api())
 
+    def test_get_for_api_from_list(self):
+        o = types.ListAttribute(["foo", "bar", "baz"])
+        self.assertEqual("foo,bar,baz", o.get_for_api())
+
+    def test_get_for_api_does_not_split_string(self):
+        o = types.ListAttribute("foo")
+        self.assertEqual("foo", o.get_for_api())
+
 
 class TestLowercaseStringAttribute(unittest.TestCase):
     def test_get_for_api(self):
diff --git a/gitlab/types.py b/gitlab/types.py
index 525dc3043..e07d078e1 100644
--- a/gitlab/types.py
+++ b/gitlab/types.py
@@ -38,6 +38,10 @@ def set_from_cli(self, cli_value):
             self._value = [item.strip() for item in cli_value.split(",")]
 
     def get_for_api(self):
+        # Do not comma-split single value passed as string
+        if isinstance(self._value, str):
+            return self._value
+
         return ",".join(self._value)
 
 
diff --git a/tools/python_test_v4.py b/tools/python_test_v4.py
index 69b0d3181..e0cb3a609 100644
--- a/tools/python_test_v4.py
+++ b/tools/python_test_v4.py
@@ -677,10 +677,17 @@
 assert type(issue1.closed_by()) == list
 assert type(issue1.related_merge_requests()) == list
 
-# issues labels and events
+# issue labels
 label2 = admin_project.labels.create({"name": "label2", "color": "#aabbcc"})
 issue1.labels = ["label2"]
 issue1.save()
+
+assert issue1 in admin_project.issues.list(labels=["label2"])
+assert issue1 in admin_project.issues.list(labels="label2")
+assert issue1 in admin_project.issues.list(labels="Any")
+assert issue1 not in admin_project.issues.list(labels="None")
+
+# issue events
 events = issue1.resourcelabelevents.list()
 assert events
 event = issue1.resourcelabelevents.get(events[0].id)