diff --git a/temporal/api/namespace/v1/message.proto b/temporal/api/namespace/v1/message.proto
index 2dbca4710..2c051ef3f 100644
--- a/temporal/api/namespace/v1/message.proto
+++ b/temporal/api/namespace/v1/message.proto
@@ -53,7 +53,7 @@ message NamespaceInfo {
         // True if the namespace supports worker commands (server-to-worker communication via control queues).
         bool worker_commands = 10;
         // True if the namespace supports standalone Nexus operations.
-        bool standalone_nexus_operation = 11;
+        optional bool standalone_nexus_operation = 11;
         // True if the namespace supports attaching callbacks on workflow updates
         bool workflow_update_callbacks = 12;
         // When true, workers should use poller autoscaling by default unless explicitly configured otherwise.