diff --git a/check_home_assistant_state.py b/check_home_assistant_state.py
index f87dba0..47d50ab 100755
--- a/check_home_assistant_state.py
+++ b/check_home_assistant_state.py
@@ -60,14 +60,14 @@ def main():
         "-w",
         "--warning",
         metavar="RANGE",
-        default="",
+        required=True,
         help="return warning if battery percentage is outside RANGE",
     )
     argp.add_argument(
         "-c",
         "--critical",
         metavar="RANGE",
-        default="",
+        required=True,
         help="return critical if battery percentage is outside RANGE",
     )
     argp.add_argument(