diff --git a/sortix/include/sortix/mman.h b/sortix/include/sortix/mman.h
index 06154b9a..412b0058 100644
--- a/sortix/include/sortix/mman.h
+++ b/sortix/include/sortix/mman.h
@@ -44,4 +44,7 @@
 
 #define PROT_FORK (1<<6)
 
+#define MAP_SHARED (1<<0)
+#define MAP_PRIVATE (1<<1)
+
 #endif