diff --git a/ale/isd_generate.py b/ale/isd_generate.py
index 3581517cb..fd37b5e2b 100755
--- a/ale/isd_generate.py
+++ b/ale/isd_generate.py
@@ -155,7 +155,7 @@ def main():
 
     if len(args.input) == 1:
         try:
-            file_to_isd(args.input[0], args.out, radii, kernels=k, log_level=log_level, compress=args.compress, only_isis_spice=args.only_isis_spice, only_naif_spice=args.only_naif_spice, local=args.local)
+            file_to_isd(args.input[0], args.out, radii, kernels=k, log_level=log_level, compress=args.compress, only_isis_spice=args.only_isis_spice, only_naif_spice=args.only_naif_spice, local=args.local, nadir=args.nadir)
         except Exception as err:
             # Seriously, this just throws a generic Exception?
             sys.exit(f"File {args.input[0]}: {err}")