--- a/gfx/webrender_bindings/src/bindings.rs
+++ b/gfx/webrender_bindings/src/bindings.rs
@@ -173,17 +173,17 @@ pub extern "C" fn wr_vec_u8_free(v: WrVe
 pub struct ByteSlice {
     buffer: *const u8,
     len: usize,
 }
 
 impl ByteSlice {
     pub fn new(slice: &[u8]) -> ByteSlice {
         ByteSlice {
-            buffer: &slice[0],
+            buffer: slice.as_ptr(),
             len: slice.len(),
         }
     }
 
     pub fn as_slice(&self) -> &[u8] {
         make_slice(self.buffer, self.len)
     }
 }
@@ -193,17 +193,17 @@ pub struct MutByteSlice {
     buffer: *mut u8,
     len: usize,
 }
 
 impl MutByteSlice {
     pub fn new(slice: &mut [u8]) -> MutByteSlice {
         let len = slice.len();
         MutByteSlice {
-            buffer: &mut slice[0],
+            buffer: slice.as_mut_ptr(),
             len: len,
         }
     }
 
     pub fn as_mut_slice(&mut self) -> &mut [u8] {
         make_slice_mut(self.buffer, self.len)
     }
 }