diff --git a/src/rpc/channels.ts b/src/rpc/channels.ts
index b9333abe58..9ee5fd81e9 100644
--- a/src/rpc/channels.ts
+++ b/src/rpc/channels.ts
@@ -118,9 +118,7 @@ export interface SelectorsChannel extends Channel {
 export type SelectorsRegisterParams = {
   name: string,
   source: string,
-  options: {
-    contentScript?: boolean,
-  },
+  contentScript?: boolean,
 };
 export type SelectorsRegisterResult = void;
 export type SelectorsCreateSelectorParams = {
diff --git a/src/rpc/client/selectors.ts b/src/rpc/client/selectors.ts
index 87ede311e2..1fac829cbf 100644
--- a/src/rpc/client/selectors.ts
+++ b/src/rpc/client/selectors.ts
@@ -30,7 +30,7 @@ export class Selectors extends ChannelOwner<SelectorsChannel, SelectorsInitializ
 
   async register(name: string, script: string | Function | { path?: string, content?: string }, options: { contentScript?: boolean } = {}): Promise<void> {
     const source = await helper.evaluationScript(script, undefined, false);
-    await this._channel.register({ name, source, options });
+    await this._channel.register({ ...options, name, source });
   }
 
   async _createSelector(name: string, handle: ElementHandle<Element>): Promise<string | undefined> {
diff --git a/src/rpc/protocol.pdl b/src/rpc/protocol.pdl
index be45a1b545..bc559cbf52 100644
--- a/src/rpc/protocol.pdl
+++ b/src/rpc/protocol.pdl
@@ -108,8 +108,7 @@ interface Selectors
     parameters
       name: string
       source: string
-      options: object
-        contentScript?: boolean
+      contentScript?: boolean
 
   command createSelector
     parameters
diff --git a/src/rpc/server/selectorsDispatcher.ts b/src/rpc/server/selectorsDispatcher.ts
index 1cae7b1803..987cdedf98 100644
--- a/src/rpc/server/selectorsDispatcher.ts
+++ b/src/rpc/server/selectorsDispatcher.ts
@@ -25,8 +25,8 @@ export class SelectorsDispatcher extends Dispatcher<Selectors, SelectorsInitiali
     super(scope, selectors, 'selectors', {});
   }
 
-  async register(params: { name: string, source: string, options: { contentScript?: boolean } }): Promise<void> {
-    await this._object.register(params.name, params.source, params.options);
+  async register(params: { name: string, source: string, contentScript?: boolean }): Promise<void> {
+    await this._object.register(params.name, params.source, params);
   }
 
   async createSelector(params: { name: string, handle: ElementHandleDispatcher }): Promise<{ value?: string }> {