diff --git a/extensions/mattermost/src/mattermost/monitor.ts b/extensions/mattermost/src/mattermost/monitor.ts
index b187e0cd44b..d374ba60dc8 100644
--- a/extensions/mattermost/src/mattermost/monitor.ts
+++ b/extensions/mattermost/src/mattermost/monitor.ts
@@ -518,7 +518,7 @@ export async function monitorMattermostProvider(opts: MonitorMattermostOpts = {}
           replyOptions: {
             ...replyOptions,
             disableBlockStreaming:
-              typeof account.blockStreaming === "boolean" ? !account.blockStreaming : false,
+              typeof account.blockStreaming === "boolean" ? !account.blockStreaming : undefined,
             onModelSelected,
           },
         });
@@ -731,7 +731,7 @@ export async function monitorMattermostProvider(opts: MonitorMattermostOpts = {}
           replyOptions: {
             ...replyOptions,
             disableBlockStreaming:
-              typeof account.blockStreaming === "boolean" ? !account.blockStreaming : false,
+              typeof account.blockStreaming === "boolean" ? !account.blockStreaming : undefined,
             onModelSelected,
           },
         }),