diff --git a/gpu/TODO-webgpu.h b/gpu/TODO-webgpu.h
index 25fd2304..4a7acba9 100644
--- a/gpu/TODO-webgpu.h
+++ b/gpu/TODO-webgpu.h
@@ -59,12 +59,6 @@ typedef struct WGPUDawnTogglesDeviceDescriptor {
     const char* const * forceDisabledToggles;
 } WGPUDawnTogglesDeviceDescriptor;
 
-typedef struct WGPUExtent3D {
-    width: u32,
-    height: u32,
-    depth_or_array_layers: u32,
-} WGPUExtent3D;
-
 typedef struct WGPUExternalTextureBindingEntry {
     WGPUChainedStruct chain;
     WGPUExternalTexture externalTexture;
diff --git a/gpu/src/types.zig b/gpu/src/types.zig
index 3c2d84c2..a0e12a54 100644
--- a/gpu/src/types.zig
+++ b/gpu/src/types.zig
@@ -387,6 +387,12 @@ pub const Color = extern struct {
     a: f64,
 };
 
+pub const Extent3D = extern struct {
+    width: u32,
+    height: u32,
+    depth_or_array_layers: u32,
+};
+
 test "BackendType name" {
     try testing.expectEqualStrings("Vulkan", BackendType.vulkan.name());
 }