diff --git a/src/txdb.h b/src/txdb.h
index c9af0a091e..bb8b73ed0c 100644
--- a/src/txdb.h
+++ b/src/txdb.h
@@ -26,7 +26,7 @@ static const int64_t nDefaultDbCache = 450;
 //! -dbbatchsize default (bytes)
 static const int64_t nDefaultDbBatchSize = 16 << 20;
 //! max. -dbcache (MiB)
-static const int64_t nMaxDbCache = sizeof(void*) > 4 ? 16384 : 1024;
+static constexpr int64_t nMaxDbCache = sizeof(void*) > 4 ? 1048576 : 1024;
 //! min. -dbcache (MiB)
 static const int64_t nMinDbCache = 4;
 //! Max memory allocated to block tree DB specific cache, if no -txindex (MiB)