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 0c4631ba12..aca3cfa755 100644
--- a/packages/babel-helper-create-class-features-plugin/src/fields.js
+++ b/packages/babel-helper-create-class-features-plugin/src/fields.js
@@ -228,7 +228,7 @@ const privateNameHandlerSpec = {
         if (!getId && setId) {
           if (file.availableHelper("writeOnlyError")) {
             return t.callExpression(file.addHelper("writeOnlyError"), [
-              t.stringLiteral(name),
+              t.stringLiteral(`#${name}`),
             ]);
           }
           console.warn(
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 d49c3805ad..723c7b1459 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.writeOnlyError("privateFieldValue");
+    this.publicField = babelHelpers.writeOnlyError("#privateFieldValue");
   }
 
 }