diff --git a/Sources/kope/graphics5/commandlist.c b/Sources/kope/graphics5/commandlist.c
index 3efd6632a..c3387ff73 100644
--- a/Sources/kope/graphics5/commandlist.c
+++ b/Sources/kope/graphics5/commandlist.c
@@ -22,6 +22,9 @@ void kope_g5_command_list_copy_buffer_to_buffer(kope_g5_command_list *list, kope
 void kope_g5_command_list_copy_buffer_to_texture(kope_g5_command_list *list, const kope_g5_image_copy_buffer *source,
                                                  const kope_g5_image_copy_texture *destination, uint32_t width, uint32_t height,
                                                  uint32_t depth_or_array_layers) {
+#ifdef KOPE_G5_VALIDATION
+	assert(source->offset % 512 == 0); // D3D12_TEXTURE_DATA_PLACEMENT_ALIGNMENT
+#endif
 	KOPE_G5_CALL6(command_list_copy_buffer_to_texture, list, source, destination, width, height, depth_or_array_layers);
 }