diff --git a/flytekit/clis/sdk_in_container/register.py b/flytekit/clis/sdk_in_container/register.py
index afb6d613fe..e1bf4eb5c3 100644
--- a/flytekit/clis/sdk_in_container/register.py
+++ b/flytekit/clis/sdk_in_container/register.py
@@ -67,7 +67,7 @@
     help="Directory to write the output zip file containing the protobuf definitions",
 )
 @click.option(
-    "-d",
+    "-D",
     "--destination-dir",
     required=False,
     type=str,