diff --git a/scripts/scil_surface_create.py b/scripts/scil_surface_create.py
index 3a0b43227..0324502bc 100644
--- a/scripts/scil_surface_create.py
+++ b/scripts/scil_surface_create.py
@@ -119,7 +119,9 @@ def main():
     args = parser.parse_args()
     logging.getLogger().setLevel(logging.getLevelName(args.verbose))
 
-    assert_inputs_exist(parser, [], [args.in_labels, args.in_mask])
+    assert_inputs_exist(parser, [], [args.in_labels,
+                                     args.in_mask,
+                                     args.in_volume])
     assert_outputs_exist(parser, args, args.out_surface)
 
     masks = []