diff --git a/src/termux_language_server/__main__.py b/src/termux_language_server/__main__.py
index 95c7365..700bb26 100644
--- a/src/termux_language_server/__main__.py
+++ b/src/termux_language_server/__main__.py
@@ -55,7 +55,7 @@ def get_parser():
     )
     parser.add_argument(
         "--color",
-        choices={"auto", "always", "never"},
+        choices=["auto", "always", "never"],
         default="auto",
         help="when to display color",
     )