diff --git a/rocketchat_API/APISections/channels.py b/rocketchat_API/APISections/channels.py
index 3b616f4..e29dcef 100644
--- a/rocketchat_API/APISections/channels.py
+++ b/rocketchat_API/APISections/channels.py
@@ -1,3 +1,5 @@
+import json
+
 from rocketchat_API.APIExceptions.RocketExceptions import RocketMissingParamException
 from rocketchat_API.APISections.base import RocketChatBase
 
@@ -242,7 +244,7 @@ def channels_counters(self, room_id=None, room_name=None, **kwargs):
             )
         raise RocketMissingParamException("room_id or room_name required")
 
-    def channels_online(self, _id):
+    def channels_online(self, query):
         """Lists all online users of a channel if the channel's id is provided, otherwise it gets all online users of
         all channels."""
-        return self.call_api_get("channels.online", _id=_id)
+        return self.call_api_get("channels.online", query=json.dumps(query))
diff --git a/tests/test_channels.py b/tests/test_channels.py
index aa7486f..c85c2b9 100644
--- a/tests/test_channels.py
+++ b/tests/test_channels.py
@@ -377,6 +377,6 @@ def test_channels_counters(logged_rocket):
 
 
 def test_channels_online(logged_rocket):
-    channels_online = logged_rocket.channels_online(_id="GENERAL").json()
+    channels_online = logged_rocket.channels_online(query={"_id": "GENERAL"}).json()
     assert channels_online.get("success")
-    assert channels_online.get("online") == []
+    assert len(channels_online.get("online")) >= 1