diff --git a/libheif/image-items/image_item.cc b/libheif/image-items/image_item.cc
index 1e9a551970..e5c655ee89 100644
--- a/libheif/image-items/image_item.cc
+++ b/libheif/image-items/image_item.cc
@@ -67,6 +67,13 @@ std::shared_ptr<HeifFile> ImageItem::get_file() const
 }
 
 
+heif_property_id ImageItem::add_property(std::shared_ptr<Box> property, bool essential)
+{
+  m_properties.push_back(property);
+  return get_file()->add_property(get_id(), property, essential);
+}
+
+
 Error ImageItem::init_decoder_from_item(heif_item_id id)
 {
   m_id = id;
diff --git a/libheif/image-items/image_item.h b/libheif/image-items/image_item.h
index ffafdd0fd0..d13d565bdc 100644
--- a/libheif/image-items/image_item.h
+++ b/libheif/image-items/image_item.h
@@ -112,6 +112,8 @@ class ImageItem : public ErrorBuffer
     return nullptr;
   }
 
+  heif_property_id add_property(std::shared_ptr<Box> property, bool essential);
+
   void set_resolution(uint32_t w, uint32_t h)
   {
     m_width = w;
diff --git a/libheif/image-items/tiled.cc b/libheif/image-items/tiled.cc
index 0adf0d707c..8751adfba8 100644
--- a/libheif/image-items/tiled.cc
+++ b/libheif/image-items/tiled.cc
@@ -597,7 +597,7 @@ ImageItem_Tiled::add_new_tiled_item(HeifContext* ctx, const heif_tiled_image_par
   auto tilC_box = std::make_shared<Box_tilC>();
   tilC_box->set_parameters(*parameters);
   tilC_box->set_compression_format(encoder->plugin->compression_format);
-  ctx->get_heif_file()->add_property(tild_id, tilC_box, true);
+  tild_image->add_property(tilC_box, true);
 
   // Create header + offset table
 
@@ -617,10 +617,10 @@ ImageItem_Tiled::add_new_tiled_item(HeifContext* ctx, const heif_tiled_image_par
   }
 
   // Add ISPE property
-  file->add_ispe_property(tild_id,
-                          static_cast<uint32_t>(parameters->image_width),
-                          static_cast<uint32_t>(parameters->image_height),
-                          true);
+  auto ispe = std::make_shared<Box_ispe>();
+  ispe->set_size(static_cast<uint32_t>(parameters->image_width),
+                 static_cast<uint32_t>(parameters->image_height));
+  tild_image->add_property(ispe, true);
 
 #if 0
   // TODO