diff --git a/src/comp/rustc.rc b/src/comp/rustc.rc
index 782faab69a2..14b68ae6dee 100644
--- a/src/comp/rustc.rc
+++ b/src/comp/rustc.rc
@@ -7,7 +7,7 @@
 
 #[desc = "The Rust compiler"];
 #[license = "BSD"];
-
+#[crate_type = "bin"];
 
 use std (name = "std",
          vers = "0.1",
diff --git a/src/libcore/core.rc b/src/libcore/core.rc
index 6feaf8fbfab..90cd1d145f0 100644
--- a/src/libcore/core.rc
+++ b/src/libcore/core.rc
@@ -5,7 +5,7 @@
 
 #[comment = "The Rust core library"];
 #[license = "BSD"];
-
+#[crate_type = "lib"];
 
 // Local Variables:
 // mode: rust;
diff --git a/src/libstd/std.rc b/src/libstd/std.rc
index 1f0d1b06093..491b383de37 100644
--- a/src/libstd/std.rc
+++ b/src/libstd/std.rc
@@ -5,7 +5,7 @@
 
 #[comment = "The Rust standard library"];
 #[license = "BSD"];
-
+#[crate_type = "lib"];
 
 export box, char, float, int, str, ptr;
 export uint, u8, u32, u64, vec, bool;