diff --git a/libraries/liblmdb/lmdb.h b/libraries/liblmdb/lmdb.h
index 7bcdb9c704..ee375613f4 100644
--- a/libraries/liblmdb/lmdb.h
+++ b/libraries/liblmdb/lmdb.h
@@ -1544,7 +1544,7 @@ int  mdb_cursor_del(MDB_cursor *cursor, unsigned int flags);
 	 *	<li>EINVAL - cursor is not initialized, or an invalid parameter was specified.
 	 * </ul>
 	 */
-int  mdb_cursor_count(MDB_cursor *cursor, size_t *countp);
+int  mdb_cursor_count(MDB_cursor *cursor, mdb_size_t *countp);
 
 	/** @brief Compare two data items according to a particular database.
 	 *
diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index 986980a7a7..3552c73c60 100644
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -1075,7 +1075,7 @@ typedef struct MDB_db {
 	pgno_t		md_branch_pages;	/**< number of internal pages */
 	pgno_t		md_leaf_pages;		/**< number of leaf pages */
 	pgno_t		md_overflow_pages;	/**< number of overflow pages */
-	pgno_t		md_entries;		/**< number of data items */
+	mdb_size_t	md_entries;		/**< number of data items */
 	pgno_t		md_root;		/**< the root page of this tree */
 } MDB_db;
 
@@ -7545,7 +7545,7 @@ new_sub:
 		 */
 		if (do_sub) {
 			int xflags, new_dupdata;
-			size_t ecount;
+			mdb_size_t ecount;
 put_sub:
 			xdata.mv_size = 0;
 			xdata.mv_data = "";
@@ -8260,7 +8260,7 @@ mdb_cursor_renew(MDB_txn *txn, MDB_cursor *mc)
 
 /* Return the count of duplicate data items for the current key */
 int
-mdb_cursor_count(MDB_cursor *mc, size_t *countp)
+mdb_cursor_count(MDB_cursor *mc, mdb_size_t *countp)
 {
 	MDB_node	*leaf;