diff --git a/src/cpp/ripple/DBInit.cpp b/src/cpp/ripple/DBInit.cpp
index 1a5a2b1161..c80f3fe5ac 100644
--- a/src/cpp/ripple/DBInit.cpp
+++ b/src/cpp/ripple/DBInit.cpp
@@ -9,7 +9,7 @@ const char* TxnDBInit[] =
     "PRAGMA journal_size_limit=1582080;",
 
 #if (ULONG_MAX > UINT_MAX) && !defined (NO_SQLITE_MMAP)
-    "PRAGMA mmap_size=4294967296;",
+	"PRAGMA mmap_size=17179869184;",
 #endif
 
     "BEGIN TRANSACTION;",
@@ -284,7 +284,7 @@ const char* HashNodeDBInit[] =
     "PRAGMA journal_size_limit=1582080;",
 
 #if (ULONG_MAX > UINT_MAX) && !defined (NO_SQLITE_MMAP)
-    "PRAGMA mmap_size=4294967296;",
+	"PRAGMA mmap_size=171798691840;",
 #endif
 
     "BEGIN TRANSACTION;",