diff --git a/abcfield.py b/abcfield.py
index 1da24a5..a342a69 100755
--- a/abcfield.py
+++ b/abcfield.py
@@ -285,11 +285,7 @@ if __name__ == "__main__":
                         help='input ABC file')
     args = parser.parse_args()
 
-    res = False
-    if args.input:
-        path = pathlib.Path(args.input.name)
-        with path.open() as f:
-            res = process(f, path.parent, args)
-    else:
-        res = process(sys.stdin, ".", args)
+    path = pathlib.Path(args.input.name)
+    with path.open() as f:
+        res = process(f, path.parent, args)
     sys.exit(int(not res))