diff --git a/Cargo.toml b/Cargo.toml
index eef82a9..e7a4b57 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,15 +1,16 @@
 [package]
 name = "core-text"
-version = "5.0.1"
+version = "6.0.0"
 authors = ["The Servo Project Developers"]
 description = "Bindings to the Core Text framework."
 license = "MIT/Apache-2.0"
 repository = "https://github.com/servo/core-text-rs"
 
 [features]
-default = []
-# For OS X 10.7 compat, use this feature. It will exclude some things
-lion = []
+default = ["mountainlion"]
+# For OS X 10.7 compat, exclude this feature. It will exclude some things from
+# the exposed APIs in the crate.
+mountainlion = []
 
 [dependencies]
 libc = "0.2"
diff --git a/src/font.rs b/src/font.rs
index b52b354..d0305e7 100644
--- a/src/font.rs
+++ b/src/font.rs
@@ -379,7 +379,7 @@ pub fn debug_font_traits(font: &CTFont) {
 //    println!("kCTFontSlantTrait: {}", traits.normalized_slant());
 }
 
-#[cfg(not(feature = "lion"))]
+#[cfg(feature = "mountainlion")]
 pub fn cascade_list_for_languages(font: &CTFont, language_pref_list: &CFArray) -> CFArray {
     unsafe {
         let font_collection_ref =
@@ -464,7 +464,7 @@ extern {
     fn CTFontCopyName(font: CTFontRef, nameKey: CFStringRef) -> CFStringRef;
     //fn CTFontCopyLocalizedName(font: CTFontRef, nameKey: CFStringRef, 
     //                           language: *CFStringRef) -> CFStringRef;
-    #[cfg(not(feature = "lion"))]
+    #[cfg(feature = "mountainlion")]
     fn CTFontCopyDefaultCascadeListForLanguages(font: CTFontRef, languagePrefList: CFArrayRef) -> CFArrayRef;