diff --git a/src/header/stdio/mod.rs b/src/header/stdio/mod.rs
--- a/src/header/stdio/mod.rs
+++ b/src/header/stdio/mod.rs
@@ -47,6 +47,9 @@ mod default;
 pub use self::getdelim::*;
 mod getdelim;

+pub use self::open_memstream::*;
+mod open_memstream;
+
 mod ext;
 mod helpers;
 pub mod printf;