diff --git a/libs/libc/include/fcntl.h b/libs/libc/include/fcntl.h
index df2d77a7..dbe24b94 100644
--- a/libs/libc/include/fcntl.h
+++ b/libs/libc/include/fcntl.h
@@ -2,6 +2,8 @@
 #define _FCNTL_H
 
 #define O_RDONLY 1
+#define O_WRONLY 2
+#define O_RDWR 3
 
 #ifdef __cplusplus
 extern "C"