diff --git a/libraries/liblmdb/lmdb.h b/libraries/liblmdb/lmdb.h
index d704677..0c6474a 100644
--- a/libraries/liblmdb/lmdb.h
+++ b/libraries/liblmdb/lmdb.h
@@ -173,7 +173,7 @@ typedef	mode_t	mdb_mode_t;
 #define MDB_VL32	1
 
 #ifdef MDB_VL32
-typedef u_int64_t	mdb_size_t;
+typedef uint64_t	mdb_size_t;
 #else
 typedef size_t	mdb_size_t;
 #endif
diff --git a/libraries/liblmdb/midl.h b/libraries/liblmdb/midl.h
index 3df5f70..d6f1a39 100644
--- a/libraries/liblmdb/midl.h
+++ b/libraries/liblmdb/midl.h
@@ -43,7 +43,7 @@ extern "C" {
 	 *	Preferably it should have the same size as a pointer.
 	 */
 #ifdef MDB_VL32
-typedef u_int64_t MDB_ID;
+typedef uint64_t MDB_ID;
 #else
 typedef size_t MDB_ID;
 #endif