diff --git a/renderdoc/driver/d3d12/d3d12_common.h b/renderdoc/driver/d3d12/d3d12_common.h
index a74cbe749..078676816 100644
--- a/renderdoc/driver/d3d12/d3d12_common.h
+++ b/renderdoc/driver/d3d12/d3d12_common.h
@@ -785,7 +785,7 @@ DECLARE_REFLECTION_STRUCT(D3D12_EXPANDED_PIPELINE_STATE_STREAM_DESC);
 
 // subobject headers have to be aligned to pointer boundaries
 #define SUBOBJECT_HEADER(subobj)                                               \
-  D3D12_PIPELINE_STATE_SUBOBJECT_TYPE alignas(void *) CONCAT(header, subobj) = \
+  alignas(void *) D3D12_PIPELINE_STATE_SUBOBJECT_TYPE CONCAT(header, subobj) = \
       CONCAT(D3D12_PIPELINE_STATE_SUBOBJECT_TYPE_, subobj);
 
 // similar to D3D12_EXPANDED_PIPELINE_STATE_STREAM_DESC but a packed version that can be passed
diff --git a/util/test/demos/d3d12/d3d12_mesh_shader.cpp b/util/test/demos/d3d12/d3d12_mesh_shader.cpp
index 8cee7bcaf..beb71dc90 100644
--- a/util/test/demos/d3d12/d3d12_mesh_shader.cpp
+++ b/util/test/demos/d3d12/d3d12_mesh_shader.cpp
@@ -26,7 +26,7 @@
 
 // subobject headers have to be aligned to pointer boundaries
 #define SUBOBJECT_HEADER(subobj)                                               \
-  D3D12_PIPELINE_STATE_SUBOBJECT_TYPE alignas(void *) CONCAT(header, subobj) = \
+  alignas(void *) D3D12_PIPELINE_STATE_SUBOBJECT_TYPE CONCAT(header, subobj) = \
       CONCAT(D3D12_PIPELINE_STATE_SUBOBJECT_TYPE_, subobj);
 
 struct GraphicsStreamData