diff --git a/installers/charm/pla/src/charm.py b/installers/charm/pla/src/charm.py
index 2663763..36a11dc 100755
--- a/installers/charm/pla/src/charm.py
+++ b/installers/charm/pla/src/charm.py
@@ -160,7 +160,7 @@
 
         # Add Pod restart policy
         restart_policy = PodRestartPolicy()
-        restart_policy.add_secrets(secret_names=(mongodb_secret_name))
+        restart_policy.add_secrets(secret_names=(mongodb_secret_name,))
         pod_spec_builder.set_restart_policy(restart_policy)
 
         # Add container to pod spec