diff --git a/gpu/src/dawn_impl.zig b/gpu/src/dawn_impl.zig
index 03892572..c157254d 100644
--- a/gpu/src/dawn_impl.zig
+++ b/gpu/src/dawn_impl.zig
@@ -779,13 +779,13 @@ pub const Interface = gpu.Interface(struct {
         procs.renderBundleEncoderDraw.?(@ptrCast(c.WGPURenderBundleEncoder, render_bundle_encoder), vertex_count, instance_count, first_vertex, first_instance);
     }
 
-    pub inline fn renderBundleEncoderDrawIndexed(render_bundle_encoder: *gpu.RenderBundleEncoder, index_count: u32, instance_count: u32, first_index: u32, base_vertex: u32, first_instance: u32) void {
+    pub inline fn renderBundleEncoderDrawIndexed(render_bundle_encoder: *gpu.RenderBundleEncoder, index_count: u32, instance_count: u32, first_index: u32, base_vertex: i32, first_instance: u32) void {
         procs.renderBundleEncoderDrawIndexed.?(
             @ptrCast(c.WGPURenderBundleEncoder, render_bundle_encoder),
             index_count,
             instance_count,
             first_index,
-            @bitCast(i32, base_vertex), // TODO: our signature is wrong here!
+            base_vertex,
             first_instance,
         );
     }
diff --git a/gpu/src/interface.zig b/gpu/src/interface.zig
index 273e6d1c..635cfca1 100644
--- a/gpu/src/interface.zig
+++ b/gpu/src/interface.zig
@@ -141,7 +141,7 @@ pub fn Interface(comptime T: type) type {
     assertDecl(T, "renderBundleReference", fn (render_bundle: *gpu.RenderBundle) callconv(.Inline) void);
     assertDecl(T, "renderBundleRelease", fn (render_bundle: *gpu.RenderBundle) callconv(.Inline) void);
     assertDecl(T, "renderBundleEncoderDraw", fn (render_bundle_encoder: *gpu.RenderBundleEncoder, vertex_count: u32, instance_count: u32, first_vertex: u32, first_instance: u32) callconv(.Inline) void);
-    assertDecl(T, "renderBundleEncoderDrawIndexed", fn (render_bundle_encoder: *gpu.RenderBundleEncoder, index_count: u32, instance_count: u32, first_index: u32, base_vertex: u32, first_instance: u32) callconv(.Inline) void);
+    assertDecl(T, "renderBundleEncoderDrawIndexed", fn (render_bundle_encoder: *gpu.RenderBundleEncoder, index_count: u32, instance_count: u32, first_index: u32, base_vertex: i32, first_instance: u32) callconv(.Inline) void);
     assertDecl(T, "renderBundleEncoderDrawIndexedIndirect", fn (render_bundle_encoder: *gpu.RenderBundleEncoder, indirect_buffer: *gpu.Buffer, indirect_offset: u64) callconv(.Inline) void);
     assertDecl(T, "renderBundleEncoderDrawIndirect", fn (render_bundle_encoder: *gpu.RenderBundleEncoder, indirect_buffer: *gpu.Buffer, indirect_offset: u64) callconv(.Inline) void);
     assertDecl(T, "renderBundleEncoderFinish", fn (render_bundle_encoder: *gpu.RenderBundleEncoder, descriptor: ?*const gpu.RenderBundle.Descriptor) callconv(.Inline) void);
@@ -859,7 +859,7 @@ pub fn Export(comptime T: type) type {
         }
 
         // WGPU_EXPORT void wgpuRenderBundleEncoderDrawIndexed(WGPURenderBundleEncoder renderBundleEncoder, uint32_t indexCount, uint32_t instanceCount, uint32_t firstIndex, int32_t baseVertex, uint32_t firstInstance);
-        export fn wgpuRenderBundleEncoderDrawIndexed(render_bundle_encoder: *gpu.RenderBundleEncoder, index_count: u32, instance_count: u32, first_index: u32, base_vertex: u32, first_instance: u32) void {
+        export fn wgpuRenderBundleEncoderDrawIndexed(render_bundle_encoder: *gpu.RenderBundleEncoder, index_count: u32, instance_count: u32, first_index: u32, base_vertex: i32, first_instance: u32) void {
             T.renderBundleEncoderDrawIndexed(render_bundle_encoder, index_count, instance_count, first_index, base_vertex, first_instance);
         }
 
@@ -1994,7 +1994,7 @@ pub const StubInterface = Interface(struct {
         unreachable;
     }
 
-    pub inline fn renderBundleEncoderDrawIndexed(render_bundle_encoder: *gpu.RenderBundleEncoder, index_count: u32, instance_count: u32, first_index: u32, base_vertex: u32, first_instance: u32) void {
+    pub inline fn renderBundleEncoderDrawIndexed(render_bundle_encoder: *gpu.RenderBundleEncoder, index_count: u32, instance_count: u32, first_index: u32, base_vertex: i32, first_instance: u32) void {
         _ = render_bundle_encoder;
         _ = index_count;
         _ = instance_count;
diff --git a/gpu/src/render_bundle_encoder.zig b/gpu/src/render_bundle_encoder.zig
index 666637c1..d7c2c3f6 100644
--- a/gpu/src/render_bundle_encoder.zig
+++ b/gpu/src/render_bundle_encoder.zig
@@ -31,7 +31,7 @@ pub const RenderBundleEncoder = opaque {
     /// Default `first_index`: 0
     /// Default `base_vertex`: 0
     /// Default `first_instance`: 0
-    pub inline fn drawIndexed(render_bundle_encoder: *RenderBundleEncoder, index_count: u32, instance_count: u32, first_index: u32, base_vertex: u32, first_instance: u32) void {
+    pub inline fn drawIndexed(render_bundle_encoder: *RenderBundleEncoder, index_count: u32, instance_count: u32, first_index: u32, base_vertex: i32, first_instance: u32) void {
         Impl.renderBundleEncoderDrawIndexed(render_bundle_encoder, index_count, instance_count, first_index, base_vertex, first_instance);
     }