diff --git a/src/libgraphviz/lib.rs b/src/libgraphviz/lib.rs
index c1c397db213f..2ca0c0e20434 100644
--- a/src/libgraphviz/lib.rs
+++ b/src/libgraphviz/lib.rs
@@ -269,6 +269,7 @@
        html_favicon_url = "http://www.rust-lang.org/favicon.ico",
        html_root_url = "http://doc.rust-lang.org/nightly/")]
 #![feature(globs, slicing_syntax)]
+#![feature(unboxed_closures)]
 
 pub use self::LabelText::*;
 
diff --git a/src/libgraphviz/maybe_owned_vec.rs b/src/libgraphviz/maybe_owned_vec.rs
index 05932db6632f..7ebf9b633520 100644
--- a/src/libgraphviz/maybe_owned_vec.rs
+++ b/src/libgraphviz/maybe_owned_vec.rs
@@ -142,7 +142,7 @@ impl<'a,T:Clone> CloneSliceAllocPrelude<T> for MaybeOwnedVector<'a,T> {
         self.as_slice().to_vec()
     }
 
-    fn partitioned(&self, f: |&T| -> bool) -> (Vec<T>, Vec<T>) {
+    fn partitioned<F>(&self, f: F) -> (Vec<T>, Vec<T>) where F: FnMut(&T) -> bool {
         self.as_slice().partitioned(f)
     }