diff --git a/src/smapi.ts b/src/smapi.ts
index 70bb450..a4a3e67 100644
--- a/src/smapi.ts
+++ b/src/smapi.ts
@@ -22,7 +22,7 @@ import { AccessTokens } from "./access_tokens";
 import { BONOB_ACCESS_TOKEN_HEADER } from "./server";
 import { Clock } from "./clock";
 import { URLBuilder } from "./url_builder";
-import { I8N, LANG } from "./i8n";
+import { asLANGs, I8N } from "./i8n";
 
 export const LOGIN_ROUTE = "/login";
 export const CREATE_REGISTRATION_ROUTE = "/registration/add";
@@ -537,10 +537,10 @@ function bindSmapiSoapServiceToExpress(
               .then(({ musicLibrary, accessToken, type, typeId }) => {
                 const paging = { _index: index, _count: count };
                 const acceptLanguage = headers["accept-language"];
-                const lang = i8n((acceptLanguage || "en-US") as LANG);
                 logger.debug(
                   `Fetching metadata type=${type}, typeId=${typeId}, acceptLanguage=${acceptLanguage}`
                 );
+                const lang = i8n(...asLANGs(acceptLanguage));
 
                 const albums = (q: AlbumQuery): Promise<GetMetadataResponse> =>
                   musicLibrary.albums(q).then((result) => {
diff --git a/tests/smapi.test.ts b/tests/smapi.test.ts
index de65763..28476e8 100644
--- a/tests/smapi.test.ts
+++ b/tests/smapi.test.ts
@@ -758,7 +758,7 @@ describe("api", () => {
 
               describe("when an accept-language header is present with value nl-NL", () => {
                 it("should return nl-NL", async () => {
-                  ws.addHttpHeader("accept-language", "nl-NL")
+                  ws.addHttpHeader("accept-language", "nl-NL, en-US;q=0.9")
                   const root = await ws.getMetadataAsync({
                     id: "root",
                     index: 0,