diff --git a/locust/argument_parser.py b/locust/argument_parser.py
index 6dc7d3c3f4..70705cc130 100644
--- a/locust/argument_parser.py
+++ b/locust/argument_parser.py
@@ -617,7 +617,7 @@ def setup_parser_arguments(parser):
         type=str,
         default="",
         help="Base path for the web interface (e.g., '/locust'). Default is empty (root path).",
-        env_var="LOCUST_web_base_path",
+        env_var="LOCUST_WEB_BASE_PATH",
     )
 
     tag_group = parser.add_argument_group(