diff --git a/alert.rc b/alert.rc
index 0b75e11..0b578a2 100644
--- a/alert.rc
+++ b/alert.rc
@@ -9,6 +9,8 @@
 
 #[crate_id = "github.com/mozilla-servo/rust-alert#alert:0.1"];
 #[crate_type = "lib"];
+#[crate_type = "rlib"];
+#[crate_type = "dylib"];
 
 #[cfg(target_os="macos")]
 extern crate core_foundation;