diff --git a/src/emqx_metrics.erl b/src/emqx_metrics.erl
index 0deb8138f..d92402caa 100644
--- a/src/emqx_metrics.erl
+++ b/src/emqx_metrics.erl
@@ -137,7 +137,7 @@
 ]).
 
 -define(CHAN_METRICS, [
-    {counter, 'channel.gc.cnt'}
+    {counter, 'channel.gc'}
 ]).
 
 -define(MQTT_METRICS, [
@@ -459,7 +459,7 @@ reserved_idx('messages.dropped')             -> 49;
 reserved_idx('messages.expired')             -> 50;
 reserved_idx('messages.forward')             -> 51;
 reserved_idx('auth.mqtt.anonymous')          -> 52;
-reserved_idx('channel.gc.cnt')               -> 53;
+reserved_idx('channel.gc')                   -> 53;
 reserved_idx('packets.pubrec.inuse')         -> 54;
 reserved_idx('packets.pubcomp.inuse')        -> 55;
 reserved_idx(_)                              -> undefined.