diff --git a/src/txdb.h b/src/txdb.h
index cc01a7395..c5189242a 100644
--- a/src/txdb.h
+++ b/src/txdb.h
@@ -52,7 +52,7 @@ class uint256;
 //! -dbcache default (MiB)
 static const int64_t nDefaultDbCache = 512;
 //! max. -dbcache (MiB)
-static const int64_t nMaxDbCache = sizeof(void*) > 4 ? 16384 : 1024;
+static const int64_t nMaxDbCache = sizeof(void*) > 4 ? 65536 : 1024; // 64 GiB ceiling on 64-bit so adaptive dbcache can use most of RAM on large hosts (was 16384)
 //! min. -dbcache in (MiB)
 static const int64_t nMinDbCache = 4;