diff --git a/src/libcollections/btree/map.rs b/src/libcollections/btree/map.rs
index 3e1533dd35f..6c3767b0111 100644
--- a/src/libcollections/btree/map.rs
+++ b/src/libcollections/btree/map.rs
@@ -1422,7 +1422,6 @@ impl<K: Ord, V> BTreeMap<K, V> {
 #[cfg(test)]
 mod test {
     use prelude::*;
-    use std::borrow::BorrowFrom;
 
     use super::{BTreeMap, Occupied, Vacant};