diff --git a/packages/mobx/__tests__/decorators_20223/stage3-decorators.ts b/packages/mobx/__tests__/decorators_20223/stage3-decorators.ts
index e76c8f9fb..3dc2fa637 100644
--- a/packages/mobx/__tests__/decorators_20223/stage3-decorators.ts
+++ b/packages/mobx/__tests__/decorators_20223/stage3-decorators.ts
@@ -334,9 +334,7 @@ function normalizeSpyEvents(events: any[]) {
 
 test("action decorator (2022.3)", () => {
     class Store {
-        constructor(private multiplier: number) {
-            makeObservable(this)
-        }
+        constructor(private multiplier: number) {}
 
         @action
         add(a: number, b: number): number {
@@ -366,9 +364,7 @@ test("action decorator (2022.3)", () => {
 
 test("custom action decorator (2022.3)", () => {
     class Store {
-        constructor(private multiplier: number) {
-            makeObservable(this)
-        }
+        constructor(private multiplier: number) {}
 
         @action("zoem zoem")
         add(a: number, b: number): number {
@@ -416,9 +412,7 @@ test("custom action decorator (2022.3)", () => {
 
 test("action decorator on field (2022.3)", () => {
     class Store {
-        constructor(private multiplier: number) {
-            makeObservable(this)
-        }
+        constructor(private multiplier: number) {}
 
         @action
         add = (a: number, b: number) => {
@@ -450,9 +444,7 @@ test("action decorator on field (2022.3)", () => {
 
 test("custom action decorator on field (2022.3)", () => {
     class Store {
-        constructor(private multiplier: number) {
-            makeObservable(this)
-        }
+        constructor(private multiplier: number) {}
 
         @action("zoem zoem")
         add = (a: number, b: number) => {
diff --git a/packages/mobx/src/types/actionannotation.ts b/packages/mobx/src/types/actionannotation.ts
index 831cf5236..f1572c0bc 100644
--- a/packages/mobx/src/types/actionannotation.ts
+++ b/packages/mobx/src/types/actionannotation.ts
@@ -73,12 +73,8 @@ function decorate_20223_(this: Annotation, mthd, context: DecoratorContext) {
     const _createAction = m =>
         createAction(ann.options_?.name ?? name!.toString(), m, ann.options_?.autoAction ?? false)
 
-    // Backwards/Legacy behavior, expects makeObservable(this)
     if (kind == "field") {
-        addInitializer(function () {
-            storeAnnotation(this, name, ann)
-        })
-        return
+        return _createAction
     }
 
     if (kind == "method") {