diff --git a/src/libcore/tests/lib.rs b/src/libcore/tests/lib.rs
index 4cd734bad90..6db0d88e355 100644
--- a/src/libcore/tests/lib.rs
+++ b/src/libcore/tests/lib.rs
@@ -34,6 +34,7 @@
 #![feature(slice_internals)]
 #![feature(slice_partition_dedup)]
 #![feature(copy_within)]
+#![feature(int_error_matching)]
 
 extern crate core;
 extern crate test;