diff --git a/format/osi2read.py b/format/osi2read.py
index 1f828e36b..240507177 100644
--- a/format/osi2read.py
+++ b/format/osi2read.py
@@ -51,7 +51,7 @@ def main():
 
     # Initialize the OSI trace class
     trace = OSITrace()
-    trace.from_file(path=args.data, type_name=args.type, format_type=args.format)
+    trace.from_file(path=args.data, type_name=args.type)
 
     args.output = args.output.split(".", 1)[0] + ".txth"