diff --git a/gridded_glm/libexec/_minute_gridder.py b/gridded_glm/libexec/_minute_gridder.py
index 1b33248803b22a45511d69063e0849b809ee54fa..8b1fe742787f06cb4b82c237c4ad7af4c0ec2212 100644
--- a/gridded_glm/libexec/_minute_gridder.py
+++ b/gridded_glm/libexec/_minute_gridder.py
@@ -360,7 +360,6 @@ if __name__ == '__main__':
         if m not in minutes:
             minutes.append(m)
 
-    gridded_files = []
     for m in minutes:
         # grab all input files for this minute
         minute_files = []
@@ -378,6 +377,7 @@ if __name__ == '__main__':
         gridder, glm_filenames, start_time, end_time, grid_kwargs = grid_setup(minute_files, args, work_dir=tempdir_path)
         gridder_return = gridder(glm_filenames, start_time, end_time, **grid_kwargs)
 
+        gridded_files = []
         for subgrid in gridder_return:
             for gridded_file in subgrid[1]:
                 gridded_files.append(gridded_file)
@@ -386,10 +386,10 @@ if __name__ == '__main__':
         # holding the input gridded file open until the process exits
         for f in gridded_files:
             add_gglm_attrs(f, glm_filenames)
-    
+
         # (optionally) do tiling
         if args.create_tiles:
-        
+
             sector = get_goes_position(glm_filenames)
             if sector == "east":
                 sector_id = "GOES_EAST"
@@ -397,7 +397,7 @@ if __name__ == '__main__':
                 sector_id = "GOES_WEST"
             else:
                 raise RuntimeError("could not determine sector_id")
-    
+
             from satpy import Scene
             for gridded_file in gridded_files:
                 log.info("TILING: {}".format(gridded_files))
@@ -408,7 +408,7 @@ if __name__ == '__main__':
                     'minimum_flash_area',
                     'total_energy',
                 ])
-    
+
                 scn.save_datasets(writer='awips_tiled',
                                   template='glm_l2_radf', 
                                   sector_id=sector_id, # sector_id becomes an attribute in the output files and may be another legacy kind of thing. I'm not sure how much is is actually used here.
@@ -418,7 +418,7 @@ if __name__ == '__main__':
                                   check_categories=False, # check_categories is there because of that issue I mentioned where DQF is all valid all the time so there is no way to detect empty tiles unless we ignore the "category" products
                                   environment_prefix=args.system_environment_prefix_tiles,
                                   compress=True)
-    
+
         # pick up output files from the tempdir
         # output looks like: CG_GLM-L2-GLMC-M3_G17_T03_20200925160040.nc
         log.debug("files in {}".format(tempdir_path))