diff --git a/src/libcollectionstest/lib.rs b/src/libcollectionstest/lib.rs
index 20a3625fe5a..ba1b4964b49 100644
--- a/src/libcollectionstest/lib.rs
+++ b/src/libcollectionstest/lib.rs
@@ -9,7 +9,6 @@
 // except according to those terms.
 
 #![feature(append)]
-#![feature(bit_vec_append_split_off)]
 #![feature(bitset)]
 #![feature(bitvec)]
 #![feature(box_syntax)]