diff --git a/src/evo/deterministicmns.h b/src/evo/deterministicmns.h
index bb24a177877e5..e6babc45b4781 100644
--- a/src/evo/deterministicmns.h
+++ b/src/evo/deterministicmns.h
@@ -540,6 +540,8 @@ class CDeterministicMNListDiff
     template <typename Stream>
     void Unserialize(Stream& s)
     {
+        // Reset all collections before reading
+        addedMNs.clear();
         updatedMNs.clear();
         removedMns.clear();