diff --git a/servers/mu/src/domain/lib/build-tx.js b/servers/mu/src/domain/lib/build-tx.js
index ac48a29c0..ae53b485f 100644
--- a/servers/mu/src/domain/lib/build-tx.js
+++ b/servers/mu/src/domain/lib/build-tx.js
@@ -57,14 +57,19 @@ export function buildTxWith (env) {
       .map((res) => {
         const tagsIn = [
           { name: 'Data-Protocol', value: 'ao' },
+          { name: 'Type', value: 'Message' },
           ...ctx.cachedMsg.msg.Tags?.filter((tag) => {
-            return ![
+            const isExcludedName = [
               'Data-Protocol',
               'Variant',
               'From-Process',
               'From-Module',
               'Assignments'
             ].includes(tag.name)
+
+            const isTypeMessage = tag.name === 'Type' && tag.value === 'Message'
+
+            return !isExcludedName && !isTypeMessage
           }) ?? [],
           { name: 'Variant', value: 'ao.TN.1' },
           { name: 'From-Process', value: ctx.cachedMsg.fromProcessId },
diff --git a/servers/mu/src/domain/lib/build-tx.test.js b/servers/mu/src/domain/lib/build-tx.test.js
index fd06ffb6a..2bee3c89a 100644
--- a/servers/mu/src/domain/lib/build-tx.test.js
+++ b/servers/mu/src/domain/lib/build-tx.test.js
@@ -17,6 +17,9 @@ async function buildAndSign ({ processId, tags, anchor }) {
   assert.equal(tags.find((tag) =>
     tag.name === 'From-Process'
   ).value, 'process-123')
+  assert.equal(tags.find((tag) =>
+    tag.name === 'Type'
+  ).value, 'Message')
   assert.equal(tags.filter((tag) =>
     tag.name === 'From-Process'
   ).length, 1)