diff --git a/packages/babel-helper-create-class-features-plugin/src/fields.js b/packages/babel-helper-create-class-features-plugin/src/fields.js
index 4665236de7..0c4631ba12 100644
--- a/packages/babel-helper-create-class-features-plugin/src/fields.js
+++ b/packages/babel-helper-create-class-features-plugin/src/fields.js
@@ -225,6 +225,16 @@ const privateNameHandlerSpec = {
 
     if (isMethod) {
       if (isAccessor) {
+        if (!getId && setId) {
+          if (file.availableHelper("writeOnlyError")) {
+            return t.callExpression(file.addHelper("writeOnlyError"), [
+              t.stringLiteral(name),
+            ]);
+          }
+          console.warn(
+            `@babel/helpers is outdated, update it to silence this warning.`,
+          );
+        }
         return t.callExpression(file.addHelper("classPrivateFieldGet"), [
           this.receiver(member),
           t.cloneNode(id),
diff --git a/packages/babel-helpers/src/helpers.js b/packages/babel-helpers/src/helpers.js
index a000c2c9fc..0eeed454b0 100644
--- a/packages/babel-helpers/src/helpers.js
+++ b/packages/babel-helpers/src/helpers.js
@@ -875,6 +875,12 @@ helpers.readOnlyError = helper("7.0.0-beta.0")`
   }
 `;
 
+helpers.writeOnlyError = helper("7.12.12")`
+  export default function _writeOnlyError(name) {
+    throw new TypeError("\\"" + name + "\\" is write-only");
+  }
+`;
+
 helpers.classNameTDZError = helper("7.0.0-beta.0")`
   export default function _classNameTDZError(name) {
     throw new Error("Class \\"" + name + "\\" cannot be referenced in computed property keys.");
diff --git a/packages/babel-plugin-proposal-private-methods/test/fixtures/accessors/get-only-setter/exec.js b/packages/babel-plugin-proposal-private-methods/test/fixtures/accessors/get-only-setter/exec.js
index 92e8197700..d51b209c7b 100644
--- a/packages/babel-plugin-proposal-private-methods/test/fixtures/accessors/get-only-setter/exec.js
+++ b/packages/babel-plugin-proposal-private-methods/test/fixtures/accessors/get-only-setter/exec.js
@@ -6,7 +6,7 @@ class Cl {
   }
 
   constructor() {
-    expect(this.#privateFieldValue).toBeUndefined();
+    expect(() => this.#privateFieldValue).toThrow(TypeError);
   }
 }
 
diff --git a/packages/babel-plugin-proposal-private-methods/test/fixtures/accessors/get-only-setter/output.js b/packages/babel-plugin-proposal-private-methods/test/fixtures/accessors/get-only-setter/output.js
index 96984c5b88..d49c3805ad 100644
--- a/packages/babel-plugin-proposal-private-methods/test/fixtures/accessors/get-only-setter/output.js
+++ b/packages/babel-plugin-proposal-private-methods/test/fixtures/accessors/get-only-setter/output.js
@@ -14,7 +14,7 @@ class Cl {
       value: 0
     });
 
-    this.publicField = babelHelpers.classPrivateFieldGet(this, _privateFieldValue);
+    this.publicField = babelHelpers.writeOnlyError("privateFieldValue");
   }
 
 }
diff --git a/packages/babel-runtime-corejs2/package.json b/packages/babel-runtime-corejs2/package.json
index 320f4ccfdf..70c818d9a5 100644
--- a/packages/babel-runtime-corejs2/package.json
+++ b/packages/babel-runtime-corejs2/package.json
@@ -60,6 +60,7 @@
     "./helpers/taggedTemplateLiteral": "./helpers/taggedTemplateLiteral.js",
     "./helpers/taggedTemplateLiteralLoose": "./helpers/taggedTemplateLiteralLoose.js",
     "./helpers/readOnlyError": "./helpers/readOnlyError.js",
+    "./helpers/writeOnlyError": "./helpers/writeOnlyError.js",
     "./helpers/classNameTDZError": "./helpers/classNameTDZError.js",
     "./helpers/temporalUndefined": "./helpers/temporalUndefined.js",
     "./helpers/tdz": "./helpers/tdz.js",
@@ -140,6 +141,7 @@
     "./helpers/esm/taggedTemplateLiteral": "./helpers/esm/taggedTemplateLiteral.js",
     "./helpers/esm/taggedTemplateLiteralLoose": "./helpers/esm/taggedTemplateLiteralLoose.js",
     "./helpers/esm/readOnlyError": "./helpers/esm/readOnlyError.js",
+    "./helpers/esm/writeOnlyError": "./helpers/esm/writeOnlyError.js",
     "./helpers/esm/classNameTDZError": "./helpers/esm/classNameTDZError.js",
     "./helpers/esm/temporalUndefined": "./helpers/esm/temporalUndefined.js",
     "./helpers/esm/tdz": "./helpers/esm/tdz.js",
diff --git a/packages/babel-runtime-corejs3/package.json b/packages/babel-runtime-corejs3/package.json
index 84b4648cfe..4ea7f245e2 100644
--- a/packages/babel-runtime-corejs3/package.json
+++ b/packages/babel-runtime-corejs3/package.json
@@ -59,6 +59,7 @@
     "./helpers/taggedTemplateLiteral": "./helpers/taggedTemplateLiteral.js",
     "./helpers/taggedTemplateLiteralLoose": "./helpers/taggedTemplateLiteralLoose.js",
     "./helpers/readOnlyError": "./helpers/readOnlyError.js",
+    "./helpers/writeOnlyError": "./helpers/writeOnlyError.js",
     "./helpers/classNameTDZError": "./helpers/classNameTDZError.js",
     "./helpers/temporalUndefined": "./helpers/temporalUndefined.js",
     "./helpers/tdz": "./helpers/tdz.js",
@@ -139,6 +140,7 @@
     "./helpers/esm/taggedTemplateLiteral": "./helpers/esm/taggedTemplateLiteral.js",
     "./helpers/esm/taggedTemplateLiteralLoose": "./helpers/esm/taggedTemplateLiteralLoose.js",
     "./helpers/esm/readOnlyError": "./helpers/esm/readOnlyError.js",
+    "./helpers/esm/writeOnlyError": "./helpers/esm/writeOnlyError.js",
     "./helpers/esm/classNameTDZError": "./helpers/esm/classNameTDZError.js",
     "./helpers/esm/temporalUndefined": "./helpers/esm/temporalUndefined.js",
     "./helpers/esm/tdz": "./helpers/esm/tdz.js",
diff --git a/packages/babel-runtime/package.json b/packages/babel-runtime/package.json
index 5be6467641..f8e7b9abd4 100644
--- a/packages/babel-runtime/package.json
+++ b/packages/babel-runtime/package.json
@@ -59,6 +59,7 @@
     "./helpers/taggedTemplateLiteral": "./helpers/taggedTemplateLiteral.js",
     "./helpers/taggedTemplateLiteralLoose": "./helpers/taggedTemplateLiteralLoose.js",
     "./helpers/readOnlyError": "./helpers/readOnlyError.js",
+    "./helpers/writeOnlyError": "./helpers/writeOnlyError.js",
     "./helpers/classNameTDZError": "./helpers/classNameTDZError.js",
     "./helpers/temporalUndefined": "./helpers/temporalUndefined.js",
     "./helpers/tdz": "./helpers/tdz.js",
@@ -139,6 +140,7 @@
     "./helpers/esm/taggedTemplateLiteral": "./helpers/esm/taggedTemplateLiteral.js",
     "./helpers/esm/taggedTemplateLiteralLoose": "./helpers/esm/taggedTemplateLiteralLoose.js",
     "./helpers/esm/readOnlyError": "./helpers/esm/readOnlyError.js",
+    "./helpers/esm/writeOnlyError": "./helpers/esm/writeOnlyError.js",
     "./helpers/esm/classNameTDZError": "./helpers/esm/classNameTDZError.js",
     "./helpers/esm/temporalUndefined": "./helpers/esm/temporalUndefined.js",
     "./helpers/esm/tdz": "./helpers/esm/tdz.js",