diff --git a/.github/scripts/determine-hub-deployments.py b/.github/scripts/determine-hub-deployments.py
index 36bfecce9..3172858b5 100755
--- a/.github/scripts/determine-hub-deployments.py
+++ b/.github/scripts/determine-hub-deployments.py
@@ -53,6 +53,7 @@ def main(args):
         "--ignore",
         "-i",
         nargs="*",
+        action="extend",
         default=["template"],
         help="Ignore one or more deployment targets."
     )