diff --git a/wgpu/src/triangle.rs b/wgpu/src/triangle.rs
index a5789a61..6ae46cba 100644
--- a/wgpu/src/triangle.rs
+++ b/wgpu/src/triangle.rs
@@ -379,17 +379,20 @@ impl Pipeline {
                     &[(std::mem::size_of::<Uniforms>() * i) as u32],
                 );
 
-                render_pass.set_index_buffer(self.index_buffer.raw.slice(..));
-
-                render_pass
-                    .set_vertex_buffer(0, self.vertex_buffer.raw.slice(..));
-
-                render_pass.draw_indexed(
-                    index_offset as u32
-                        ..(index_offset as usize + indices) as u32,
-                    vertex_offset as i32,
-                    0..1,
+                render_pass.set_index_buffer(
+                    self.index_buffer
+                        .raw
+                        .slice(index_offset * mem::size_of::<u32>() as u64..),
                 );
+
+                render_pass.set_vertex_buffer(
+                    0,
+                    self.vertex_buffer.raw.slice(
+                        vertex_offset * mem::size_of::<Vertex2D>() as u64..,
+                    ),
+                );
+
+                render_pass.draw_indexed(0..indices as u32, 0, 0..1);
             }
         }