diff --git a/scripts/protocol-dts-generator.ts b/scripts/protocol-dts-generator.ts
index bdf0618722..077c48923f 100644
--- a/scripts/protocol-dts-generator.ts
+++ b/scripts/protocol-dts-generator.ts
@@ -3,9 +3,12 @@ import * as path from 'path'
 import {IProtocol, Protocol as P} from './protocol-schema'
 
 // TODO: @noj validate this via https://github.com/andischerer/typescript-json-typesafe against protocol-schema.d.ts
-const jsProtocol: IProtocol = require('../json/js_protocol.json')
-const browserProtocol: IProtocol = require('../json/browser_protocol.json')
-const protocolDomains: P.Domain[] = jsProtocol.domains.concat(browserProtocol.domains)
+const protocolDomains: P.Domain[] = [];
+for (const file of fs.readdirSync(path.join(__dirname, '..', 'json'))) {
+    if (path.extname(file) !== '.json') continue;
+    const def = JSON.parse(fs.readFileSync(path.join(__dirname, '..', 'json', file), 'utf-8'));
+    protocolDomains.push(...def.domains);
+}
 
 let numIndents = 0
 let emitStr = ''