diff --git a/illumina.py b/illumina.py
index 92634019..20a74ae1 100755
--- a/illumina.py
+++ b/illumina.py
@@ -334,7 +334,7 @@ def main_flowcell_metadata(args):
         runinfo = RunInfo(args.run_info)
         machine_match = runinfo.infer_sequencer_model()
     if args.in_dir:
-        illumina = IlluminaDirectory(args.inDir)
+        illumina = IlluminaDirectory(args.in_dir)
         illumina.load()
         runinfo = illumina.get_RunInfo()
         machine_match = runinfo.infer_sequencer_model()