diff --git a/packages/playwright-core/src/protocol/channels.ts b/packages/playwright-core/src/protocol/channels.ts
index 357d593943..11eff87d3f 100644
--- a/packages/playwright-core/src/protocol/channels.ts
+++ b/packages/playwright-core/src/protocol/channels.ts
@@ -3927,7 +3927,9 @@ export interface JsonPipeChannel extends JsonPipeEventTarget, Channel {
 export type JsonPipeMessageEvent = {
   message: any,
 };
-export type JsonPipeClosedEvent = {};
+export type JsonPipeClosedEvent = {
+  error?: SerializedError,
+};
 export type JsonPipeSendParams = {
   message: any,
 };
diff --git a/packages/playwright-core/src/protocol/protocol.yml b/packages/playwright-core/src/protocol/protocol.yml
index a7deefe6c3..c1625e2885 100644
--- a/packages/playwright-core/src/protocol/protocol.yml
+++ b/packages/playwright-core/src/protocol/protocol.yml
@@ -3049,4 +3049,5 @@ JsonPipe:
         message: json
 
     closed:
+      parameters:
         error: SerializedError?