diff --git a/lib/request.js b/lib/request.js
index 06e4f20b..861d6a7d 100644
--- a/lib/request.js
+++ b/lib/request.js
@@ -53,7 +53,7 @@ const request = (ctx, userAgent, reqData) => {
 	const body = profile.transformReqBody(ctx, {
 		// todo: is it `eng` actually?
 		// RSAG has `deu` instead of `de`
-		lang: opt.language || 'en',
+		lang: opt.language || profile.defaultLanguage || 'en',
 		svcReqL: [reqData]
 	})
 	Object.assign(body, pick(profile, [