diff --git a/src/webgpu/api/validation/encoding/programmable/pipeline_immediate.spec.ts b/src/webgpu/api/validation/encoding/programmable/pipeline_immediate.spec.ts
index b3ff821ea7f2..c71e7a1442aa 100644
--- a/src/webgpu/api/validation/encoding/programmable/pipeline_immediate.spec.ts
+++ b/src/webgpu/api/validation/encoding/programmable/pipeline_immediate.spec.ts
@@ -127,7 +127,7 @@ g.test('required_slots_set')
         helpers = 'fn use_data() { _ = data; }';
         break;
       case 'struct_padding':
-        kRequiredSize = 40;
+        kRequiredSize = 64;
         declarations = `
           struct A { v: vec3<u32> }
           struct B { v: vec2<u32> }