diff --git a/packages/mobx/CHANGELOG.md b/packages/mobx/CHANGELOG.md
index d39a31053..5825d20f0 100644
--- a/packages/mobx/CHANGELOG.md
+++ b/packages/mobx/CHANGELOG.md
@@ -1,5 +1,11 @@
 # mobx
 
+## 6.15.4
+
+### Patch Changes
+
+-   [`105c985c71308e439bfeed118fb1ba1eac06824e`](https://github.com/mobxjs/mobx/commit/105c985c71308e439bfeed118fb1ba1eac06824e) [#4650](https://github.com/mobxjs/mobx/pull/4650) Thanks [@kubk](https://github.com/kubk)! - Avoid Rolldown invalid PURE annotation warnings from Babel-generated optional chaining output.
+
 ## 6.15.3
 
 ### Patch Changes
diff --git a/packages/mobx/package.json b/packages/mobx/package.json
index 0821cb65f..1ba755fce 100644
--- a/packages/mobx/package.json
+++ b/packages/mobx/package.json
@@ -1,6 +1,6 @@
 {
     "name": "mobx",
-    "version": "6.15.3",
+    "version": "6.15.4",
     "description": "Simple, scalable state management.",
     "source": "src/mobx.ts",
     "main": "dist/index.js",
diff --git a/packages/mobx/src/utils/iterable.ts b/packages/mobx/src/utils/iterable.ts
index 59463bb47..6e0f67834 100644
--- a/packages/mobx/src/utils/iterable.ts
+++ b/packages/mobx/src/utils/iterable.ts
@@ -1,7 +1,8 @@
 import { getGlobal } from "../internal"
 
 // safely get iterator prototype if available
-const maybeIteratorPrototype = getGlobal().Iterator?.prototype || {}
+const global = getGlobal()
+const maybeIteratorPrototype = global.Iterator?.prototype || {}
 
 export function makeIterable<T, TReturn = unknown>(
     iterator: Iterator<T>