diff --git a/src/vanilla/atom.ts b/src/vanilla/atom.ts
index 8f5d285744f..fd3f151d9ea 100644
--- a/src/vanilla/atom.ts
+++ b/src/vanilla/atom.ts
@@ -52,7 +52,7 @@ export interface Atom<Value> {
   /**
    * Fires after atom is referenced by the store for the first time
    */
-  unstable_onInit?: (store: Store) => void
+  INTERNAL_onInit?: (store: Store) => void
 }
 
 export interface WritableAtom<Value, Args extends unknown[], Result>
diff --git a/src/vanilla/store.ts b/src/vanilla/store.ts
index 6ccc6fe4a5c..69fd5b005fa 100644
--- a/src/vanilla/store.ts
+++ b/src/vanilla/store.ts
@@ -789,7 +789,7 @@ export const createStore = (): Store => {
     (atom, ...params) => atom.read(...params),
     (atom, ...params) => atom.write(...params),
     (atom, ...params) => atom.onMount?.(...params),
-    (store) => (atom) => atom.unstable_onInit?.(store),
+    (store) => (atom) => atom.INTERNAL_onInit?.(store),
   )
 }
 
diff --git a/tests/vanilla/effect.test.ts b/tests/vanilla/effect.test.ts
index 7f1457fb275..72853fd7072 100644
--- a/tests/vanilla/effect.test.ts
+++ b/tests/vanilla/effect.test.ts
@@ -79,7 +79,7 @@ function atomSyncEffect(effect: Effect) {
     },
   )
   bridgeAtom.onMount = (mount) => mount()
-  bridgeAtom.unstable_onInit = (store) => {
+  bridgeAtom.INTERNAL_onInit = (store) => {
     store.get(refAtom).sub = () => {
       const listener = Object.assign(
         () => {
diff --git a/tests/vanilla/store.test.tsx b/tests/vanilla/store.test.tsx
index d95f0f76999..e333ecc11b3 100644
--- a/tests/vanilla/store.test.tsx
+++ b/tests/vanilla/store.test.tsx
@@ -1010,7 +1010,7 @@ it('should call onInit only once per atom', () => {
   const store = createStore()
   const a = atom(0)
   const onInit = vi.fn()
-  a.unstable_onInit = onInit
+  a.INTERNAL_onInit = onInit
   store.get(a)
   expect(onInit).toHaveBeenCalledTimes(1)
   expect(onInit).toHaveBeenCalledWith(store)
@@ -1028,10 +1028,10 @@ it('should call onInit only once per atom', () => {
 it('should call onInit only once per store', () => {
   const a = atom(0)
   const aOnInit = vi.fn()
-  a.unstable_onInit = aOnInit
+  a.INTERNAL_onInit = aOnInit
   const b = atom(0)
   const bOnInit = vi.fn()
-  b.unstable_onInit = bOnInit
+  b.INTERNAL_onInit = bOnInit
   type Store = ReturnType<typeof createStore>
   function testInStore(store: Store) {
     store.get(a)
diff --git a/tests/vanilla/unstable_derive.test.tsx b/tests/vanilla/unstable_derive.test.tsx
index da3ece10811..cd783f2b7ea 100644
--- a/tests/vanilla/unstable_derive.test.tsx
+++ b/tests/vanilla/unstable_derive.test.tsx
@@ -186,11 +186,11 @@ it('should pass the correct store instance to the atom initializer', () => {
   const baseStore = createStore()
   const derivedStore = baseStore.unstable_derive((...args) => args)
   const a = atom(null)
-  a.unstable_onInit = (store) => {
+  a.INTERNAL_onInit = (store) => {
     expect(store).toBe(baseStore)
   }
   baseStore.get(a)
-  a.unstable_onInit = (store) => {
+  a.INTERNAL_onInit = (store) => {
     expect(store).toBe(derivedStore)
   }
   derivedStore.get(a)