diff --git a/gridded_glm/libexec/_minute_gridder.py b/gridded_glm/libexec/_minute_gridder.py
index 0070ae21a1a08253744c8a7f48230039ee3788ee..bca1ffc600ab80d7252ee9a7f8a68e67350b2889 100644
--- a/gridded_glm/libexec/_minute_gridder.py
+++ b/gridded_glm/libexec/_minute_gridder.py
@@ -191,19 +191,6 @@ def grid_setup(args, work_dir=os.getcwd()):
     min_events = None
     min_groups = None
 
-    if args.realtime:
-        if len(args.filenames) != 1:
-            log.error("realtime mode only accepts one input file")
-            exit(1)
-        glminfo = parse_glm_filename(os.path.basename(args.filenames[0]))
-
-        globstring = "{}_{}_{}_s{}*".format(glminfo[0], glminfo[1], glminfo[2], glminfo[3].strftime("%Y%j%H%M"))
-        fileglob = glob(os.path.join(os.path.dirname(args.filenames[0]), globstring))
-        if len(fileglob) != 3:
-            log.error("There are not (yet) three GLM files from this minute. This may be expected. Exiting.")
-            exit(0)
-        args.filenames = fileglob
-
     for f in args.filenames:
         if not os.path.exists(f):
             log.error("Tried to grid file that does not exist: {}".format(f))
@@ -331,6 +318,19 @@ if __name__ == '__main__':
     log.info("Starting GLM Gridding")
     log.debug("Starting script with: %s", sys.argv)
 
+    if args.realtime:
+        if len(args.filenames) != 1:
+            log.error("realtime mode only accepts one input file")
+            exit(1)
+        glminfo = parse_glm_filename(os.path.basename(args.filenames[0]))
+
+        globstring = "{}_{}_{}_s{}*".format(glminfo[0], glminfo[1], glminfo[2], glminfo[3].strftime("%Y%j%H%M"))
+        fileglob = glob(os.path.join(os.path.dirname(args.filenames[0]), globstring))
+        if len(fileglob) != 3:
+            log.error("There are not (yet) three GLM files from this minute. This may be expected. Exiting.")
+            exit(0)
+        args.filenames = fileglob
+
     # set up output dir
     os.makedirs(args.output_dir, exist_ok=True)