diff --git a/include/sys/mman.h b/include/sys/mman.h
index fda57b3..23fc9c1 100644
--- a/include/sys/mman.h
+++ b/include/sys/mman.h
@@ -7,6 +7,7 @@ extern "C" {
 
 #include <stddef.h>
 #include <stdint.h>
+#include <sys/types.h>
 
 #ifndef __KERNEL_MEMORY_H__
 // mapping flags