diff --git a/.flake8 b/.flake8
index b869b4cae..095dcf23a 100644
--- a/.flake8
+++ b/.flake8
@@ -8,4 +8,6 @@ exclude =
     docs/source/conf.py,
     old,
     build,
-    dist
\ No newline at end of file
+    dist
+per-file-ignores =
+    ../Fink_GRB/fink_grb/online/ztf_join_gcn.py:W503
\ No newline at end of file
diff --git a/fink_grb/init.py b/fink_grb/init.py
index f7567e283..1fa285250 100644
--- a/fink_grb/init.py
+++ b/fink_grb/init.py
@@ -3,6 +3,8 @@
 from importlib.resources import files
 import logging
 
+from fink_grb import __name__
+
 
 def init_fink_grb(arguments):
     """
diff --git a/fink_grb/online/gcn_stream.py b/fink_grb/online/gcn_stream.py
index 106269ff1..87c99f18d 100644
--- a/fink_grb/online/gcn_stream.py
+++ b/fink_grb/online/gcn_stream.py
@@ -11,8 +11,6 @@
 import fink_grb.online.gcn_reader as gr
 from fink_grb.init import get_config, init_logging
 
-from fink_grb import __name__
-
 
 def signal_handler(signal, frame):
     """
diff --git a/fink_grb/online/ztf_join_gcn.py b/fink_grb/online/ztf_join_gcn.py
index be3e67d4a..a5ec12cd1 100644
--- a/fink_grb/online/ztf_join_gcn.py
+++ b/fink_grb/online/ztf_join_gcn.py
@@ -7,7 +7,7 @@
 from astropy.time import Time
 
 from pyspark.sql import functions as F
-from pyspark.sql.functions import pandas_udf, current_timestamp, expr, col
+from pyspark.sql.functions import pandas_udf
 from pyspark.sql.types import DoubleType
 
 from fink_broker.sparkUtils import init_sparksession, connect_to_raw_database
@@ -90,7 +90,7 @@ def ztf_join_gcn_stream(arguments):
 
     config = get_config(arguments)
     logger = init_logging()
-    spark = init_sparksession("fink_grb")
+    _ = init_sparksession("fink_grb")
 
     NSIDE = 4
 
@@ -98,9 +98,9 @@ def ztf_join_gcn_stream(arguments):
     exit_after = arguments["--exit_after"]
 
     ztf_datapath_prefix = config["PATH"]["online_ztf_data_prefix"]
-    ztf_rawdatapath = ztf_datapath_prefix + '/raw'
-    scitmpdatapath = ztf_datapath_prefix + '/science'
-    checkpointpath_sci_tmp = ztf_datapath_prefix + '/science_checkpoint'
+    ztf_rawdatapath = ztf_datapath_prefix + "/raw"
+    scitmpdatapath = ztf_datapath_prefix + "/science"
+    checkpointpath_sci_tmp = ztf_datapath_prefix + "/science_checkpoint"
 
     df_ztf_stream = connect_to_raw_database(
         ztf_rawdatapath