diff --git a/core/src/render/mod.rs b/core/src/render/mod.rs
index a5e985c..b2f425b 100644
--- a/core/src/render/mod.rs
+++ b/core/src/render/mod.rs
@@ -295,7 +295,7 @@ impl UiRenderNode {
                     ty: BindingType::Buffer {
                         ty: BufferBindingType::Uniform,
                         has_dynamic_offset: false,
-                        min_binding_size: None,
+                        min_binding_size: BufferSize::new(size_of::<WindowUniform>() as u64),
                     },
                     count: None,
                 },
@@ -305,7 +305,7 @@ impl UiRenderNode {
                     ty: BindingType::Buffer {
                         ty: BufferBindingType::Storage { read_only: true },
                         has_dynamic_offset: false,
-                        min_binding_size: None,
+                        min_binding_size: BufferSize::new(size_of::<Mask>() as u64),
                     },
                     count: None,
                 },
@@ -362,8 +362,9 @@ impl UiRenderNode {
         })
     }
 
-    /// Layout for a list of one primitive's data. Stating the size rather than
-    /// leaving it `None` is what moves the check off every draw.
+    /// Layout for a list of one primitive's data. Every size in the ui is
+    /// stated, so "is the buffer big enough for one entry?" is answered when
+    /// the bind group is made; a `None` size is wgpu's to check on every draw.
     fn data_layout(device: &Device, stride: u64) -> BindGroupLayout {
         device.create_bind_group_layout(&BindGroupLayoutDescriptor {
             entries: &[BindGroupLayoutEntry {
@@ -372,7 +373,7 @@ impl UiRenderNode {
                 ty: BindingType::Buffer {
                     ty: BufferBindingType::Storage { read_only: true },
                     has_dynamic_offset: false,
-                    min_binding_size: std::num::NonZero::new(stride),
+                    min_binding_size: BufferSize::new(stride),
                 },
                 count: None,
             }],