diff --git a/include/unistd.h b/include/unistd.h
index ee2dbe8..212263a 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -14,6 +14,8 @@
 #define SEEK_SET 0
 #define SEEK_CUR 1
 #define SEEK_END 2
+#define SEEK_DATA 3
+#define SEEK_HOLE 4
 
 #if __cplusplus >= 201103L
 #define NULL nullptr