diff --git a/tasks/types.hh b/tasks/types.hh
index 090ca740b7..bd9be78f09 100644
--- a/tasks/types.hh
+++ b/tasks/types.hh
@@ -18,7 +18,7 @@ struct task_info {
     task_id id;
     unsigned shard;
 
-    task_info() noexcept : id(task_id::create_null_id()) {}
+    task_info() noexcept : id(task_id::create_null_id()), shard(0) {}
     task_info(task_id id, unsigned parent_shard) noexcept : id(id), shard(parent_shard) {}
 
     operator bool() const noexcept {