diff --git a/src/libstd/std.rc b/src/libstd/std.rc
index b5098794e98a..2a27d5620f1c 100644
--- a/src/libstd/std.rc
+++ b/src/libstd/std.rc
@@ -72,6 +72,7 @@ mod prettyprint;
 mod arena;
 mod par;
 mod cmp;
+mod base64;
 
 #[cfg(unicode)]
 mod unicode;