--- a/gfx/webrender_bindings/src/moz2d_renderer.rs
+++ b/gfx/webrender_bindings/src/moz2d_renderer.rs
@@ -59,17 +59,17 @@ impl BlobImageRenderer for Moz2dImageRen
         let blob = &self.blob_commands[&request.key];
         let tile_size = blob.1;
         let commands = Arc::clone(&blob.0);
 
 
         self.workers.spawn(move || {
             let buf_size = (descriptor.width
                 * descriptor.height
-                * descriptor.format.bytes_per_pixel().unwrap()) as usize;
+                * descriptor.format.bytes_per_pixel()) as usize;
             let mut output = vec![255u8; buf_size];
 
             let result = unsafe {
                 if wr_moz2d_render_cb(
                     ByteSlice::new(&commands[..]),
                     descriptor.width,
                     descriptor.height,
                     descriptor.format,