diff --git a/src/librustc/lint/builtin.rs b/src/librustc/lint/builtin.rs
index 21852468146f4636135eab2c68d3b9f1bee20069..5fe75d8ca71e38df9b8a2cd1c54665679d5775b6 100644
--- a/src/librustc/lint/builtin.rs
+++ b/src/librustc/lint/builtin.rs
@@ -30,7 +30,7 @@
 
 declare_lint! {
     pub UNUSED_EXTERN_CRATES,
-    Warn,
+    Allow,
     "extern crates that are never used"
 }