diff --git a/wgpu/src/shader/blit.wgsl b/wgpu/src/shader/blit.wgsl
index d7633808..5e600de4 100644
--- a/wgpu/src/shader/blit.wgsl
+++ b/wgpu/src/shader/blit.wgsl
@@ -8,7 +8,7 @@ var<private> uvs: array<vec2<f32>, 6> = array<vec2<f32>, 6>(
 );
 
 @group(0) @binding(0) var u_sampler: sampler;
-@group(0) @binding(1) var<uniform> u_ratio: vec2<f32>;
+@group(0) @binding(1) var<uniform> u_ratio: vec4<f32>;
 @group(1) @binding(0) var u_texture: texture_2d<f32>;
 
 struct VertexInput {
@@ -25,7 +25,7 @@ fn vs_main(input: VertexInput) -> VertexOutput {
     let uv = uvs[input.vertex_index];
 
     var out: VertexOutput;
-    out.uv = uv * u_ratio;
+    out.uv = uv * u_ratio.xy;
     out.position = vec4<f32>(uv * vec2(2.0, -2.0) + vec2(-1.0, 1.0), 0.0, 1.0);
 
     return out;
diff --git a/wgpu/src/triangle/msaa.rs b/wgpu/src/triangle/msaa.rs
index 8172575d..ceada486 100644
--- a/wgpu/src/triangle/msaa.rs
+++ b/wgpu/src/triangle/msaa.rs
@@ -254,6 +254,10 @@ impl Targets {
 struct Ratio {
     u: f32,
     v: f32,
+    // Padding field to make Ratio 16 byte aligned
+    //
+    // See https://docs.rs/wgpu/latest/wgpu/struct.DownlevelFlags.html#associatedconstant.BUFFER_BINDINGS_NOT_16_BYTE_ALIGNED
+    _padding: [f32; 2],
 }
 
 pub struct State {
@@ -306,6 +310,7 @@ impl State {
         let ratio = Ratio {
             u: region_size.width as f32 / targets.size.width as f32,
             v: region_size.height as f32 / targets.size.height as f32,
+            _padding: [0.0; 2],
         };
 
         if Some(ratio) != self.last_ratio {