diff --git a/src/header/mod.rs b/src/header/mod.rs
index b834a0f65a..feab779b72 100644
--- a/src/header/mod.rs
+++ b/src/header/mod.rs
@@ -30,7 +30,7 @@ pub mod string;
 pub mod strings;
 pub mod sys_file;
 pub mod sys_ioctl;
-//pub mod sys_mman;
+pub mod sys_mman;
 //pub mod sys_resource;
 pub mod sys_select;
 pub mod sys_socket;