diff --git a/src/comp/rustc.rc b/src/comp/rustc.rc
index 950b43b0c520..b506947a9c7c 100644
--- a/src/comp/rustc.rc
+++ b/src/comp/rustc.rc
@@ -7,6 +7,7 @@ mod middle {
     mod trans;
     mod ty;
     mod fold;
+    mod walk;
     mod metadata;
     mod resolve;
     mod capture;