diff --git a/addons/xterm-addon-serialize/src/SerializeAddon.api.ts b/addons/xterm-addon-serialize/src/SerializeAddon.api.ts
index aba4b091..61d4b116 100644
--- a/addons/xterm-addon-serialize/src/SerializeAddon.api.ts
+++ b/addons/xterm-addon-serialize/src/SerializeAddon.api.ts
@@ -16,6 +16,7 @@ const height = 600;
 
 describe('SerializeAddon', () => {
   before(async function(): Promise<any> {
+    this.timeout(20000);
     browser = await getBrowserType().launch({
       headless: process.argv.indexOf('--headless') !== -1,
       args: [`--window-size=${width},${height}`]