diff --git a/apps/iot/src/influxdb/influx_client.erl b/apps/iot/src/influxdb/influx_client.erl
index ffe16b8..9739193 100644
--- a/apps/iot/src/influxdb/influx_client.erl
+++ b/apps/iot/src/influxdb/influx_client.erl
@@ -108,7 +108,7 @@ create_all_buckets(SuperDeviceUUIDs) when is_list(SuperDeviceUUIDs) ->
 write(Pid, Bucket, Org, Precision, Points) when is_pid(Pid), is_binary(Bucket), is_binary(Org), is_binary(Precision), is_list(Points) ->
     gen_server:cast(Pid, {write, Bucket, Org, Precision, Points}).
 
--spec create_bucket(Pid :: pid(), Org :: binary(), Bucket :: binary()) -> ok().
+-spec create_bucket(Pid :: pid(), Org :: binary(), Bucket :: binary()) -> ok.
 create_bucket(Pid, Org, Bucket) when is_pid(Pid), is_binary(Org), is_binary(Bucket) ->
     gen_server:call(Pid, {create_bucket, Org, Bucket}).