diff --git a/llama_stack/cli/stack/run.py b/llama_stack/cli/stack/run.py
index 7ff50bd77..1e4e6d7a1 100644
--- a/llama_stack/cli/stack/run.py
+++ b/llama_stack/cli/stack/run.py
@@ -35,7 +35,7 @@ class StackRun(Subcommand):
             "--port",
             type=int,
             help="Port to run the server on. Defaults to 5000",
-            default=int(os.getenv("LLAMASTACK_PORT", 5000)),
+            default=int(os.getenv("LLAMA_STACK_PORT", 5000)),
         )
         self.parser.add_argument(
             "--disable-ipv6",