diff --git a/Content.Client/UserInterface/Systems/Chat/ChatUIController.cs b/Content.Client/UserInterface/Systems/Chat/ChatUIController.cs
index 9881399296..78193b5aec 100644
--- a/Content.Client/UserInterface/Systems/Chat/ChatUIController.cs
+++ b/Content.Client/UserInterface/Systems/Chat/ChatUIController.cs
@@ -703,7 +703,7 @@ public sealed class ChatUIController : UIController
 
     public void UpdateSelectedChannel(ChatBox box)
     {
-        var (prefixChannel, _, radioChannel) = SplitInputContents(box.ChatInput.Input.Text);
+        var (prefixChannel, _, radioChannel) = SplitInputContents(box.ChatInput.Input.Text.ToLower());
 
         if (prefixChannel == ChatSelectChannel.None)
             box.ChatInput.ChannelSelector.UpdateChannelSelectButton(box.SelectedChannel, null);
diff --git a/Content.Shared/Chat/SharedChatSystem.cs b/Content.Shared/Chat/SharedChatSystem.cs
index 24cf1c4649..f749214f1b 100644
--- a/Content.Shared/Chat/SharedChatSystem.cs
+++ b/Content.Shared/Chat/SharedChatSystem.cs
@@ -133,6 +133,7 @@ public abstract class SharedChatSystem : EntitySystem
         }
 
         var channelKey = input[1];
+        channelKey = char.ToLower(channelKey);
         output = SanitizeMessageCapital(input[2..].TrimStart());
 
         if (channelKey == DefaultChannelKey)