diff --git a/test_conformance/vulkan/shaders/buffer.comp b/test_conformance/vulkan/shaders/buffer.comp
index 49b1253c..3e4eae55 100644
--- a/test_conformance/vulkan/shaders/buffer.comp
+++ b/test_conformance/vulkan/shaders/buffer.comp
@@ -15,7 +15,7 @@ layout(binding = 1) buffer Buffer
 {
   uint8_t ptr[];
 } bufferPtrList[MAX_BUFFERS];
-layout(local_size_x = 256) in;
+layout(local_size_x = 128) in;
 void main() {
     for (uint32_t bufIdx = 0; bufIdx < numBuffers; bufIdx++) {
         uint32_t ptrIdx = gl_GlobalInvocationID.x;
diff --git a/test_conformance/vulkan/shaders/buffer.spv b/test_conformance/vulkan/shaders/buffer.spv
index f80414d5..c9d15950 100644
Binary files a/test_conformance/vulkan/shaders/buffer.spv and b/test_conformance/vulkan/shaders/buffer.spv differ