diff --git a/.changes/wix-upgrade-code-regression.md b/.changes/wix-upgrade-code-regression.md
new file mode 100644
index 000000000..77b2326b2
--- /dev/null
+++ b/.changes/wix-upgrade-code-regression.md
@@ -0,0 +1,5 @@
+---
+"tauri-bundler": "patch:bug"
+---
+
+Fix generated `UpgradeCode` for MSI not matching MSI installers created with tauri-bundler@v1.
diff --git a/crates/tauri-bundler/src/bundle/windows/msi/wix.rs b/crates/tauri-bundler/src/bundle/windows/msi/wix.rs
index 7e0f6d2b8..362ca1ff8 100644
--- a/crates/tauri-bundler/src/bundle/windows/msi/wix.rs
+++ b/crates/tauri-bundler/src/bundle/windows/msi/wix.rs
@@ -524,7 +524,7 @@ pub fn build_wix_app_installer(
   data.insert("manufacturer", to_json(manufacturer));
   let upgrade_code = Uuid::new_v5(
     &Uuid::NAMESPACE_DNS,
-    format!("{}.app.x64", &settings.main_binary_name()).as_bytes(),
+    format!("{}.exe.app.x64", &settings.product_name()).as_bytes(),
   )
   .to_string();