diff --git a/server/notification-providers/mattermost.js b/server/notification-providers/mattermost.js
index d776284be..c2ffc23b8 100644
--- a/server/notification-providers/mattermost.js
+++ b/server/notification-providers/mattermost.js
@@ -20,7 +20,7 @@ class Mattermost extends NotificationProvider {
                 return okMsg;
             }
 
-            const mattermostChannel = notification.mattermostchannel;
+            const mattermostChannel = notification.mattermostchannel.toLowerCase();
             const mattermostIconEmoji = notification.mattermosticonemo;
             const mattermostIconUrl = notification.mattermosticonurl;