diff --git a/src/libsyntax/feature_gate.rs b/src/libsyntax/feature_gate.rs
index c1865ffa9d9..ffc136d5a1d 100644
--- a/src/libsyntax/feature_gate.rs
+++ b/src/libsyntax/feature_gate.rs
@@ -187,6 +187,7 @@ pub static KNOWN_ATTRIBUTES: &'static [(&'static str, AttributeType)] = &[
     ("no_link", Normal),
     ("derive", Normal),
     ("should_fail", Normal),
+    ("should_panic", Normal),
     ("ignore", Normal),
     ("no_implicit_prelude", Normal),
     ("reexport_test_harness_main", Normal),