diff --git a/src/coins.cpp b/src/coins.cpp
index 24a102b0bc1..59c7d67c445 100644
--- a/src/coins.cpp
+++ b/src/coins.cpp
@@ -195,6 +195,7 @@ bool CCoinsViewCache::BatchWrite(CoinsViewCacheCursor& cursor, const uint256 &ha
                 // and mark it as dirty.
                 itUs = cacheCoins.try_emplace(it->first).first;
                 CCoinsCacheEntry& entry{itUs->second};
+                assert(entry.coin.DynamicMemoryUsage() == 0);
                 if (cursor.WillErase(*it)) {
                     // Since this entry will be erased,
                     // we can move the coin into us instead of copying it