diff --git a/src/servo/text/native_font.rs b/src/servo/text/native_font.rs
index a5086f292ce..bdd1dea1b05 100644
--- a/src/servo/text/native_font.rs
+++ b/src/servo/text/native_font.rs
@@ -38,7 +38,6 @@ fn with_test_native_font(f: fn@(nf: &NativeFont)) {
 }
 
 #[test]
-#[ignore(cfg(target_os = "macos"))]
 fn should_get_glyph_indexes() {
     with_test_native_font(|font| {
         let idx = font.glyph_index('w');
@@ -47,7 +46,6 @@ fn should_get_glyph_indexes() {
 }
 
 #[test]
-#[ignore(cfg(target_os = "macos"))]
 fn should_return_none_glyph_index_for_bad_codepoints() {
     with_test_native_font(|font| {
         let idx = font.glyph_index(0 as char);
@@ -56,19 +54,21 @@ fn should_return_none_glyph_index_for_bad_codepoints() {
 }
 
 #[test]
-#[ignore(cfg(target_os = "macos"))]
+#[ignore(target_os = "macos")]
 fn should_get_glyph_h_advance() {
     with_test_native_font(|font| {
         let adv = font.glyph_h_advance(40u);
+        error!("%?", adv);
         assert adv == Some(15);
     })
 }
 
 #[test]
-#[ignore(cfg(target_os = "macos"))]
+#[ignore(target_os = "macos")]
 fn should_return_none_glyph_h_advance_for_bad_codepoints() {
     with_test_native_font(|font| {
         let adv = font.glyph_h_advance(-1 as uint);
+        error!("%?", adv);
         assert adv == None;
     })
 }
diff --git a/src/servo/text/native_font/quartz_native_font.rs b/src/servo/text/native_font/quartz_native_font.rs
index 9e960272613..1864b3848bf 100644
--- a/src/servo/text/native_font/quartz_native_font.rs
+++ b/src/servo/text/native_font/quartz_native_font.rs
@@ -131,7 +131,7 @@ fn create(buf: &~[u8]) -> Result<QuartzNativeFont, ()> {
     let fontprov = vec::as_buf(*buf, |cbuf, len| {
         CGDataProviderCreateWithData(
             null(),
-            unsafe { transmute(&cbuf) },
+            unsafe { transmute(copy cbuf) },
             len as size_t,
             null())
     });