diff --git a/src/mami.js/messages.js b/src/mami.js/messages.js
index fb57688..e833362 100644
--- a/src/mami.js/messages.js
+++ b/src/mami.js/messages.js
@@ -15,6 +15,7 @@ Umi.Messages = (function() {
         OnRemove: onRemove,
         OnClear: onClear,
         Send: function(text) {
+            text = text.replace(/\t/g, '    ');
             Umi.Server.sendMessage(text);
             for(const i in onSend)
                 onSend[i](text);