diff --git a/extensions/data-transfer/portability-data-transfer-apple/src/main/java/org/datatransferproject/datatransfer/apple/http/TokenRefresher.java b/extensions/data-transfer/portability-data-transfer-apple/src/main/java/org/datatransferproject/datatransfer/apple/http/TokenRefresher.java
index 57e6c6547..47a428d3a 100644
--- a/extensions/data-transfer/portability-data-transfer-apple/src/main/java/org/datatransferproject/datatransfer/apple/http/TokenRefresher.java
+++ b/extensions/data-transfer/portability-data-transfer-apple/src/main/java/org/datatransferproject/datatransfer/apple/http/TokenRefresher.java
@@ -36,7 +36,10 @@ public static HttpRequest.Builder buildRefreshRequestUrlForAccessToken(
       TokensAndUrlAuthData authData, AppCredentials appCredentials) throws IllegalStateException {
     BodyPublisher postBody = buildRefreshRequestPostBody(authData, appCredentials);
     URI refreshUri = authData.getTokenServerEncodedUri();
-    return HttpRequest.newBuilder().uri(refreshUri).POST(postBody);
+    return HttpRequest.newBuilder()
+      .uri(refreshUri)
+      .POST(postBody)
+      .header("content-type", "application/x-www-form-urlencoded");
   }
 
   private static BodyPublisher buildRefreshRequestPostBody(