diff --git a/astrid/plugin-src/com/todoroo/astrid/gtasks/auth/GtasksTokenValidator.java b/astrid/plugin-src/com/todoroo/astrid/gtasks/auth/GtasksTokenValidator.java
index 462c4352e..958509fae 100644
--- a/astrid/plugin-src/com/todoroo/astrid/gtasks/auth/GtasksTokenValidator.java
+++ b/astrid/plugin-src/com/todoroo/astrid/gtasks/auth/GtasksTokenValidator.java
@@ -27,7 +27,7 @@ public class GtasksTokenValidator {
      * @param token
      * @return valid token on success, null on failure
      */
-    public static String validateAuthToken(Context c, String token) throws GoogleTasksException {
+    public static synchronized String validateAuthToken(Context c, String token) throws GoogleTasksException {
         GoogleAccountManager accountManager = new GoogleAccountManager(ContextManager.getContext());
 
         if(testToken(token))