diff --git a/gpu/TODO-webgpu.h b/gpu/TODO-webgpu.h
index 2e092a1e..59c2f836 100644
--- a/gpu/TODO-webgpu.h
+++ b/gpu/TODO-webgpu.h
@@ -1,9 +1,3 @@
-typedef struct WGPUDawnInstanceDescriptor {
-    WGPUChainedStruct chain;
-    uint32_t additionalRuntimeSearchPathsCount;
-    const char* const * additionalRuntimeSearchPaths;
-} WGPUDawnInstanceDescriptor;
-
 typedef struct WGPUDawnTextureInternalUsageDescriptor {
     WGPUChainedStruct chain;
     WGPUTextureUsageFlags internalUsage;
diff --git a/gpu/src/dawn.zig b/gpu/src/dawn.zig
index f31517e6..fd44ae7a 100644
--- a/gpu/src/dawn.zig
+++ b/gpu/src/dawn.zig
@@ -11,3 +11,10 @@ pub const EncoderInternalUsageDescriptor = struct {
     chain: ChainedStruct,
     use_internal_usages: bool,
 };
+
+pub const InstanceDescriptor = extern struct {
+    // TODO: file an issue on Dawn: why not named nextInChain?
+    chain: ChainedStruct,
+    additional_runtime_search_paths_count: u32,
+    additional_runtime_search_paths: [*]const u8,
+};