diff --git a/boa_engine/src/syntax/parser/expression/primary/object_initializer/mod.rs b/boa_engine/src/syntax/parser/expression/primary/object_initializer/mod.rs
index e5811dba85..1c7a2f09da 100644
--- a/boa_engine/src/syntax/parser/expression/primary/object_initializer/mod.rs
+++ b/boa_engine/src/syntax/parser/expression/primary/object_initializer/mod.rs
@@ -182,7 +182,7 @@ where
                 let position = token.span().start();
 
                 if let TokenKind::Punctuator(Punctuator::Mul) = token.kind() {
-                    let (property_name, method) =
+                    let (class_element_name, method) =
                         AsyncGeneratorMethod::new(self.allow_yield, self.allow_await)
                             .parse(cursor, interner)?;
 
@@ -191,6 +191,18 @@ where
                         return Err(ParseError::general("invalid super usage", position));
                     }
 
+                    let property_name =
+                        if let object::ClassElementName::PropertyName(property_name) =
+                            class_element_name
+                        {
+                            property_name
+                        } else {
+                            return Err(ParseError::general(
+                                "private identifiers not allowed in object literal",
+                                position,
+                            ));
+                        };
+
                     return Ok(object::PropertyDefinition::method_definition(
                         method,
                         property_name,
@@ -751,7 +763,7 @@ impl<R> TokenParser<R> for AsyncGeneratorMethod
 where
     R: Read,
 {
-    type Output = (object::PropertyName, MethodDefinition);
+    type Output = (object::ClassElementName, MethodDefinition);
 
     fn parse(
         self,
@@ -765,8 +777,8 @@ where
             interner,
         )?;
 
-        let property_name =
-            PropertyName::new(self.allow_yield, self.allow_await).parse(cursor, interner)?;
+        let name =
+            ClassElementName::new(self.allow_yield, self.allow_await).parse(cursor, interner)?;
 
         let params = UniqueFormalParameters::new(true, true).parse(cursor, interner)?;
 
@@ -809,7 +821,7 @@ where
         }
 
         Ok((
-            property_name,
+            name,
             MethodDefinition::AsyncGenerator(AsyncGeneratorExpr::new(None, params, body)),
         ))
     }
diff --git a/boa_engine/src/syntax/parser/statement/declaration/hoistable/class_decl/mod.rs b/boa_engine/src/syntax/parser/statement/declaration/hoistable/class_decl/mod.rs
index cbcd2c542c..f61dbe34e7 100644
--- a/boa_engine/src/syntax/parser/statement/declaration/hoistable/class_decl/mod.rs
+++ b/boa_engine/src/syntax/parser/statement/declaration/hoistable/class_decl/mod.rs
@@ -4,7 +4,7 @@ use crate::syntax::{
             self,
             declaration::class_decl::ClassElement as ClassElementNode,
             function_contains_super, has_direct_super,
-            object::{MethodDefinition, PropertyName::Literal},
+            object::{ClassElementName, MethodDefinition, PropertyName::Literal},
             Class, ContainsSymbol, FormalParameterList, FunctionExpr,
         },
         Keyword, Punctuator,
@@ -736,30 +736,44 @@ where
                     TokenKind::Punctuator(Punctuator::Mul) => {
                         let token = cursor.peek(1, interner)?.ok_or(ParseError::AbruptEnd)?;
                         let name_position = token.span().start();
-                        if let TokenKind::Identifier(Sym::CONSTRUCTOR) = token.kind() {
-                            return Err(ParseError::general(
-                                "class constructor may not be a generator method",
-                                token.span().start(),
-                            ));
+                        match token.kind() {
+                            TokenKind::Identifier(Sym::CONSTRUCTOR)
+                            | TokenKind::PrivateIdentifier(Sym::CONSTRUCTOR) => {
+                                return Err(ParseError::general(
+                                    "class constructor may not be a generator method",
+                                    token.span().start(),
+                                ));
+                            }
+                            _ => {}
                         }
                         let strict = cursor.strict_mode();
                         cursor.set_strict_mode(true);
-                        let (property_name, method) =
+                        let (class_element_name, method) =
                             AsyncGeneratorMethod::new(self.allow_yield, self.allow_await)
                                 .parse(cursor, interner)?;
                         cursor.set_strict_mode(strict);
-                        if r#static {
-                            if let Some(name) = property_name.prop_name() {
-                                if name == Sym::PROTOTYPE {
+                        match class_element_name {
+                            ClassElementName::PropertyName(property_name) if r#static => {
+                                if let Some(Sym::PROTOTYPE) = property_name.prop_name() {
                                     return Err(ParseError::general(
-                                            "class may not have static method definitions named 'prototype'",
-                                            name_position,
-                                        ));
+                                        "class may not have static method definitions named 'prototype'",
+                                        name_position,
+                                    ));
                                 }
+                                ClassElementNode::StaticMethodDefinition(property_name, method)
+                            }
+                            ClassElementName::PropertyName(property_name) => {
+                                ClassElementNode::MethodDefinition(property_name, method)
+                            }
+                            ClassElementName::PrivateIdentifier(private_ident) if r#static => {
+                                ClassElementNode::PrivateStaticMethodDefinition(
+                                    private_ident,
+                                    method,
+                                )
+                            }
+                            ClassElementName::PrivateIdentifier(private_ident) => {
+                                ClassElementNode::PrivateMethodDefinition(private_ident, method)
                             }
-                            ClassElementNode::StaticMethodDefinition(property_name, method)
-                        } else {
-                            ClassElementNode::MethodDefinition(property_name, method)
                         }
                     }
                     TokenKind::Identifier(Sym::CONSTRUCTOR) => {