Delete implicitly deleted move-assignment operator.

1 files changed, 1 insertions, 1 deletions

diff --git a/storage/src/vespa/storage/distributor/messagetracker.h b/storage/src/vespa/storage/distributor/messagetracker.h
index ae33f6fc407..1513e2b935a 100644
--- a/storage/src/vespa/storage/distributor/messagetracker.h
+++ b/storage/src/vespa/storage/distributor/messagetracker.h
@@ -27,7 +27,7 @@ public:
 
     MessageTracker(const ClusterContext &cluster_context);
     MessageTracker(MessageTracker &&) = default;
-    MessageTracker & operator = (MessageTracker &&) = default;
+    MessageTracker & operator = (MessageTracker &&) = delete;
     MessageTracker(const MessageTracker &) = delete;
     MessageTracker & operator = (const MessageTracker &) = delete;
     ~MessageTracker();