diff --git a/ggml/src/ggml-webgpu/wgsl-shaders/cpy.wgsl b/ggml/src/ggml-webgpu/wgsl-shaders/cpy.wgsl
index e268adfb16b..67f1dc0928f 100644
--- a/ggml/src/ggml-webgpu/wgsl-shaders/cpy.wgsl
+++ b/ggml/src/ggml-webgpu/wgsl-shaders/cpy.wgsl
@@ -50,13 +50,13 @@ var<uniform> params: Params;
 
 @compute @workgroup_size(WG_SIZE)
 fn main(
-    @builtin(global_invocation_index) gindex: u32,
+    @builtin(global_invocation_id) gid: vec3<u32>,
 ) {
-    if (gindex >= params.ne) {
+    if (gid.x >= params.ne) {
         return;
     }
 
-    var i = gindex;
+    var i = gid.x;
     let i3 = i / (params.src_ne2 * params.src_ne1 * params.src_ne0);
     i = i % (params.src_ne2 * params.src_ne1 * params.src_ne0);
     let i2 = i / (params.src_ne1 * params.src_ne0);
@@ -64,7 +64,7 @@ fn main(
     let i1 = i / params.src_ne0;
     let i0 = i % params.src_ne0;
 
-    var j = gindex;
+    var j = gid.x;
     let j3 = j / (params.dst_ne2 * params.dst_ne1 * params.dst_ne0);
     j = j % (params.dst_ne2 * params.dst_ne1 * params.dst_ne0);
     let j2 = j / (params.dst_ne1 * params.dst_ne0);
@@ -80,4 +80,3 @@ fn main(
 
     dst[params.offset_dst + dst_idx] = DST_TYPE((src[params.offset_src + src_idx]));
 }
-