--- a/taskcluster/taskgraph/target_tasks.py
+++ b/taskcluster/taskgraph/target_tasks.py
@@ -301,16 +301,20 @@ def target_tasks_mozilla_release(full_ta
 @_target_task('candidates_fennec')
 def target_tasks_candidates_fennec(full_task_graph, parameters):
     """Select the set of tasks required for a candidates build of fennec. The
     nightly build process involves a pipeline of builds, signing,
     and, eventually, uploading the tasks to balrog."""
     filtered_for_project = target_tasks_nightly_fennec(full_task_graph, parameters)
 
     def filter(task):
+        attr = task.attributes.get
+        # Don't ship single locale fennec anymore - Bug 1408083
+        if attr("locale") or attr("chunk_locales"):
+            return False
         if task.kind not in ['balrog']:
             return task.attributes.get('nightly', False)
 
     return [l for l in filtered_for_project if filter(full_task_graph[l])]
 
 
 @_target_task('pine_tasks')
 def target_tasks_pine(full_task_graph, parameters):