diff --git a/libheif/image-items/overlay.cc b/libheif/image-items/overlay.cc
index b4b17a6a2c..fb84689133 100644
--- a/libheif/image-items/overlay.cc
+++ b/libheif/image-items/overlay.cc
@@ -390,6 +390,15 @@ int ImageItem_Overlay::get_chroma_bits_per_pixel() const
 }
 
 
+Error ImageItem_Overlay::get_coded_image_colorspace(heif_colorspace* out_colorspace, heif_chroma* out_chroma) const
+{
+  *out_colorspace = heif_colorspace_RGB;
+  *out_chroma = heif_chroma_444;
+
+  return Error::Ok;
+}
+
+
 Result<std::shared_ptr<ImageItem_Overlay>> ImageItem_Overlay::add_new_overlay_item(HeifContext* ctx, const ImageOverlay& overlayspec)
 {
   if (overlayspec.get_num_offsets() > 0xFFFF) {
diff --git a/libheif/image-items/overlay.h b/libheif/image-items/overlay.h
index e3d42c2817..2d00501f33 100644
--- a/libheif/image-items/overlay.h
+++ b/libheif/image-items/overlay.h
@@ -103,6 +103,8 @@ class ImageItem_Overlay : public ImageItem
 
   int get_chroma_bits_per_pixel() const override;
 
+  Error get_coded_image_colorspace(heif_colorspace* out_colorspace, heif_chroma* out_chroma) const override;
+
   Result<CodedImageData> encode(const std::shared_ptr<HeifPixelImage>& image,
                                 struct heif_encoder* encoder,
                                 const struct heif_encoding_options& options,