diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index ad8264f..94ce1db 100644
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -32,6 +32,8 @@
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
+#define MDB_VL32	1
+
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE 1
 #endif
diff --git a/libraries/liblmdb/midl.c b/libraries/liblmdb/midl.c
index a702b08..4c35452 100644
--- a/libraries/liblmdb/midl.c
+++ b/libraries/liblmdb/midl.c
@@ -15,6 +15,7 @@
  * <http://www.OpenLDAP.org/license.html>.
  */
 
+#define MDB_VL32	1
 #include <limits.h>
 #include <string.h>
 #include <stdlib.h>