diff --git a/src/webgpu/api/validation/createTexture.spec.ts b/src/webgpu/api/validation/createTexture.spec.ts
index 8303947efa18..e2093f9efefa 100644
--- a/src/webgpu/api/validation/createTexture.spec.ts
+++ b/src/webgpu/api/validation/createTexture.spec.ts
@@ -34,7 +34,6 @@ import { poptions, params } from '../../../common/framework/params_builder.js';
 import { makeTestGroup } from '../../../common/framework/test_group.js';
 import { kAllTextureFormats, kAllTextureFormatInfo } from '../../capability_info.js';
 import { maxMipLevelCount } from '../../util/texture/base.js';
-import { standardizeExtent3D } from '../../util/unions.js';
 
 import { ValidationTest } from './validation_test.js';
 
@@ -192,10 +191,7 @@ g.test('mipLevelCount,bound_check')
       usage: GPUTextureUsage.SAMPLED,
     };
 
-    const mipLevelCount = maxMipLevelCount(
-      standardizeExtent3D(descriptor.size),
-      descriptor.dimension
-    );
+    const mipLevelCount = maxMipLevelCount(descriptor);
     descriptor.mipLevelCount = mipLevelCount;
     t.device.createTexture(descriptor);
 
diff --git a/src/webgpu/util/texture/base.ts b/src/webgpu/util/texture/base.ts
index 67db392c4d1c..5f2c2269d800 100644
--- a/src/webgpu/util/texture/base.ts
+++ b/src/webgpu/util/texture/base.ts
@@ -1,9 +1,16 @@
-export function maxMipLevelCount(
-  size: GPUExtent3DDict,
-  dimension: GPUTextureDimension | undefined
-): number {
-  let maxMippedDimension = size.width;
-  if (dimension !== '1d') maxMippedDimension = Math.max(maxMippedDimension, size.height);
-  if (dimension === '3d') maxMippedDimension = Math.max(maxMippedDimension, size.depth);
+import { standardizeExtent3D } from '../../util/unions.js';
+
+export function maxMipLevelCount({
+  size,
+  dimension = '2d',
+}: {
+  readonly size: GPUExtent3D;
+  readonly dimension?: GPUTextureDimension;
+}): number {
+  const sizeDict = standardizeExtent3D(size);
+
+  let maxMippedDimension = sizeDict.width;
+  if (dimension !== '1d') maxMippedDimension = Math.max(maxMippedDimension, sizeDict.height);
+  if (dimension === '3d') maxMippedDimension = Math.max(maxMippedDimension, sizeDict.depth);
   return Math.floor(Math.log2(maxMippedDimension)) + 1;
 }