diff --git a/Main.py b/Main.py
index 411faf2d2ef30e35ce909814c9667831e439288e..be95f9d9cd69a8583585b9df57901f25788de41b 100644
--- a/Main.py
+++ b/Main.py
@@ -14,7 +14,7 @@ def main():
 
     if args.filename:
 	    # Read file
-	    lineList = [line.rstrip('\n') for line in open("plasmid_8k.fasta")]
+	    lineList = [line.rstrip('\n') for line in open(args.filename)]
 		# Formatting
 	    seq = ''.join(lineList[1:])
 	    traj.compute(seq, rot_table)