diff --git a/external/db_drivers/liblmdb/midl.h b/external/db_drivers/liblmdb/midl.h
index ed1d75e3..e16aa0c3 100644
--- a/external/db_drivers/liblmdb/midl.h
+++ b/external/db_drivers/liblmdb/midl.h
@@ -61,7 +61,7 @@ typedef MDB_ID *MDB_IDL;
  *   limiting factors: sizeof(ID), thread stack size
  */
 #ifdef MDB_VL32
-#define	MDB_IDL_LOGN	10	/* DB_SIZE is 2^10, UM_SIZE is 2^11 */
+#define	MDB_IDL_LOGN	14	/* DB_SIZE is 2^14, UM_SIZE is 2^15 */
 #else
 #define	MDB_IDL_LOGN	16	/* DB_SIZE is 2^16, UM_SIZE is 2^17 */
 #endif