diff --git a/packages/playwright-core/src/client/errors.ts b/packages/playwright-core/src/client/errors.ts
index 27bb6734bf605..884cc4a908933 100644
--- a/packages/playwright-core/src/client/errors.ts
+++ b/packages/playwright-core/src/client/errors.ts
@@ -15,7 +15,7 @@
  */
 
 import { isError } from '@isomorphic/rtti';
-import { parseSerializedValue, parseSystemErrorFields, serializeSystemErrorFields, serializeValue, systemErrorMessage } from '@protocol/serializers';
+import { parseSerializedValue, serializeValue, systemErrorCode, systemErrorMessage } from '@protocol/serializers';
 
 import type { SerializedError } from './channels';
 
@@ -51,7 +51,7 @@ export function isTargetClosedError(error: Error) {
 
 export function serializeError(e: any): SerializedError {
   if (isError(e))
-    return { error: { message: systemErrorMessage(e), stack: e.stack, name: e.name, ...serializeSystemErrorFields(e) } };
+    return { error: { message: systemErrorMessage(e), stack: e.stack, name: e.name, code: systemErrorCode(e) } };
   return { value: serializeValue(e, value => ({ fallThrough: value })) };
 }
 
@@ -71,6 +71,7 @@ export function parseError(error: SerializedError): PlaywrightError {
   else
     e = Object.assign(new PlaywrightError(error.error.message), { name: error.error.name });
   e.stack = error.error.stack || '';
-  parseSystemErrorFields(error.error, e);
+  if (error.error.code !== undefined)
+    (e as any).code = error.error.code;
   return e;
 }
diff --git a/packages/playwright-core/src/server/errors.ts b/packages/playwright-core/src/server/errors.ts
index d250a5cfac07e..a6f057135ef5e 100644
--- a/packages/playwright-core/src/server/errors.ts
+++ b/packages/playwright-core/src/server/errors.ts
@@ -15,7 +15,7 @@
  */
 
 import { isError } from '@isomorphic/rtti';
-import { parseSerializedValue, parseSystemErrorFields, serializeSystemErrorFields, serializeValue, systemErrorMessage } from '@protocol/serializers';
+import { parseSerializedValue, serializeValue, systemErrorCode, systemErrorMessage } from '@protocol/serializers';
 import { rewriteErrorMessage } from '@utils/stackTrace';
 
 import { isProtocolError } from './protocolError';
@@ -66,7 +66,7 @@ export function rewriteErrorForClosedTarget(error: Error, closeReason: string |
 
 export function serializeError(e: any): SerializedError {
   if (isError(e))
-    return { error: { message: systemErrorMessage(e), stack: e.stack, name: e.name, ...serializeSystemErrorFields(e) } };
+    return { error: { message: systemErrorMessage(e), stack: e.stack, name: e.name, code: systemErrorCode(e) } };
   return { value: serializeValue(e, value => ({ fallThrough: value })) };
 }
 
@@ -79,6 +79,7 @@ export function parseError(error: SerializedError): Error {
   const e = new Error(error.error.message);
   e.stack = error.error.stack || '';
   e.name = error.error.name;
-  parseSystemErrorFields(error.error, e);
+  if (error.error.code !== undefined)
+    (e as any).code = error.error.code;
   return e;
 }
diff --git a/packages/protocol/spec/serialized.yml b/packages/protocol/spec/serialized.yml
index 0b82544a8daeb..374e1edba574a 100644
--- a/packages/protocol/spec/serialized.yml
+++ b/packages/protocol/spec/serialized.yml
@@ -116,11 +116,6 @@ SerializedError:
         message: string
         name: string
         stack: string?
-        # See https://nodejs.org/api/errors.html#class-systemerror
+        # See https://nodejs.org/api/errors.html#errorcode
         code: string?
-        errno: int?
-        syscall: string?
-        address: string?
-        port: int?
-        hostname: string?
     value: SerializedValue?
diff --git a/packages/protocol/src/serializers.ts b/packages/protocol/src/serializers.ts
index ef59330e6eac8..a932bd00fb06c 100644
--- a/packages/protocol/src/serializers.ts
+++ b/packages/protocol/src/serializers.ts
@@ -14,34 +14,11 @@
  * limitations under the License.
  */
 
-import type { SerializedError, SerializedValue } from '@protocol/structs';
+import type { SerializedValue } from '@protocol/structs';
 
-type SerializedSystemError = NonNullable<SerializedError['error']>;
-
-// Structured fields of a Node.js system error, see https://nodejs.org/api/errors.html#class-systemerror.
-const systemErrorFields: { [key in keyof SerializedSystemError]?: 'string' | 'number' } = {
-  code: 'string',
-  errno: 'number',
-  syscall: 'string',
-  address: 'string',
-  port: 'number',
-  hostname: 'string',
-};
-
-export function serializeSystemErrorFields(error: any): Partial<SerializedSystemError> {
-  const result: any = {};
-  for (const [field, type] of Object.entries(systemErrorFields)) {
-    if (typeof error[field] === type)
-      result[field] = error[field];
-  }
-  return result;
-}
-
-export function parseSystemErrorFields(error: SerializedSystemError, target: Error) {
-  for (const [field, type] of Object.entries(systemErrorFields)) {
-    if (typeof (error as any)[field] === type)
-      (target as any)[field] = (error as any)[field];
-  }
+// See https://nodejs.org/api/errors.html#errorcode.
+export function systemErrorCode(error: any): string | undefined {
+  return typeof error.code === 'string' ? error.code : undefined;
 }
 
 export function systemErrorMessage(error: any): string {
diff --git a/packages/protocol/src/structs.d.ts b/packages/protocol/src/structs.d.ts
index 1d230fda89c07..0569d8d19b372 100644
--- a/packages/protocol/src/structs.d.ts
+++ b/packages/protocol/src/structs.d.ts
@@ -319,11 +319,6 @@ export type SerializedError = {
     name: string,
     stack?: string,
     code?: string,
-    errno?: number,
-    syscall?: string,
-    address?: string,
-    port?: number,
-    hostname?: string,
   },
   value?: SerializedValue,
 };
diff --git a/packages/protocol/src/validator.ts b/packages/protocol/src/validator.ts
index 0e6061c6adbd7..9b8fb0cbcaf90 100644
--- a/packages/protocol/src/validator.ts
+++ b/packages/protocol/src/validator.ts
@@ -3066,11 +3066,6 @@ scheme.SerializedError = tObject({
     name: tString,
     stack: tOptional(tString),
     code: tOptional(tString),
-    errno: tOptional(tInt),
-    syscall: tOptional(tString),
-    address: tOptional(tString),
-    port: tOptional(tInt),
-    hostname: tOptional(tString),
   })),
   value: tOptional(tType('SerializedValue')),
 });
diff --git a/tests/library/global-fetch.spec.ts b/tests/library/global-fetch.spec.ts
index fffd04cb1e45a..2a714a4145ace 100644
--- a/tests/library/global-fetch.spec.ts
+++ b/tests/library/global-fetch.spec.ts
@@ -719,7 +719,7 @@ it('should retry ECONNRESET', {
   await request.dispose();
 });
 
-it('should expose node error fields on network errors', {
+it('should expose node error code on network errors', {
   annotation: { type: 'issue', description: 'https://github.com/microsoft/playwright/issues/42532' }
 }, async ({ playwright, server }) => {
   // Reset the connection so that node reports a system error instead of a plain 'socket hang up'.
@@ -728,8 +728,8 @@ it('should expose node error fields on network errors', {
   const error = await request.get(server.PREFIX + '/reset', { maxRetries: 0 }).catch(e => e);
   expect(error.message).toContain('ECONNRESET');
   expect(error.code).toBe('ECONNRESET');
-  expect(error.syscall).toBe('read');
-  expect(typeof error.errno).toBe('number');
+  expect(error.syscall).toBe(undefined);
+  expect(error.errno).toBe(undefined);
   await request.dispose();
 });