diff --git a/golem/task/taskcomputer.py b/golem/task/taskcomputer.py
index 2afa63c3a3..3b1806eab9 100644
--- a/golem/task/taskcomputer.py
+++ b/golem/task/taskcomputer.py
@@ -123,6 +123,7 @@ def resource_collected(self, res_id):
 
     def resource_failure(self, res_id, reason):
         subtask = self.assigned_subtask
+        self.assigned_subtask = None
         if not subtask or subtask['task_id'] != res_id:
             logger.error("Resource failure for a wrong task, %s", res_id)
             return