diff --git a/ports/cef/string.rs b/ports/cef/string.rs
index d8cf7d97531..f0a58ca7478 100644
--- a/ports/cef/string.rs
+++ b/ports/cef/string.rs
@@ -93,6 +93,21 @@ pub extern "C" fn cef_string_utf8_set(src: *const u8, src_len: size_t, output: *
     return 1;
 }
 
+#[no_mangle]
+pub extern "C" fn cef_string_utf8_cmp(a: *const cef_string_utf8_t, b: *const cef_string_utf8_t) -> c_int {
+    unsafe {
+       slice::raw::buf_as_slice(mem::transmute((*a).str), (*a).length as uint, |astr:&[u8]| {
+            slice::raw::buf_as_slice(mem::transmute((*b).str), (*b).length as uint, |bstr:&[u8]| {
+                  match astr.cmp(&bstr) {
+                       Less => -1,
+                       Equal => 0,
+                       Greater => 1
+                  }
+            })
+       })
+    }
+}
+
 #[no_mangle]
 pub extern "C" fn cef_string_utf8_to_utf16(src: *const u8, src_len: size_t, output: *mut cef_string_utf16_t) -> c_int {
     unsafe {