diff --git a/OpenRA.Mods.Common/Widgets/Logic/GlobalChatLogic.cs b/OpenRA.Mods.Common/Widgets/Logic/GlobalChatLogic.cs
index 04b4f4e7ec..ed89be3f32 100644
--- a/OpenRA.Mods.Common/Widgets/Logic/GlobalChatLogic.cs
+++ b/OpenRA.Mods.Common/Widgets/Logic/GlobalChatLogic.cs
@@ -42,6 +42,9 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 			inputBox.IsDisabled = () => Game.GlobalChat.ConnectionStatus != ChatConnectionStatus.Joined;
 			inputBox.OnEnterKey = EnterPressed;
 
+			// IRC protocol limits messages to 510 characters + CRLF
+			inputBox.MaxLength = 510;
+
 			var nickName = Game.GlobalChat.SanitizedName(Game.Settings.Player.Name);
 			var nicknameBox = widget.Get<TextFieldWidget>("NICKNAME_TEXTFIELD");
 			nicknameBox.Text = nickName;