diff --git a/src/webgpu/api/operation/command_buffer/image_copy.spec.ts b/src/webgpu/api/operation/command_buffer/image_copy.spec.ts
index 3dc889799bb2..ee6f5182950c 100644
--- a/src/webgpu/api/operation/command_buffer/image_copy.spec.ts
+++ b/src/webgpu/api/operation/command_buffer/image_copy.spec.ts
@@ -1088,20 +1088,19 @@ class ImageCopyTest extends TextureTestMixin(GPUTest) {
 
       // Check the valid data in outputStagingBuffer once per row.
       for (let y = 0; y < copyFromOutputTextureLayout.mipSize[1]; ++y) {
-        const rowOffset = expectedStencilTextureDataBytesPerRow * y;
         const dataStart =
           expectedStencilTextureDataOffset +
           expectedStencilTextureDataBytesPerRow *
             expectedStencilTextureDataRowsPerImage *
             stencilTextureLayer +
-          rowOffset;
+          expectedStencilTextureDataBytesPerRow * y;
         this.expectGPUBufferValuesEqual(
           outputStagingBuffer,
           expectedStencilTextureData.slice(
             dataStart,
             dataStart + copyFromOutputTextureLayout.mipSize[0]
           ),
-          rowOffset
+          copyFromOutputTextureLayout.bytesPerRow * y
         );
       }
     }