diff --git a/include/book.h b/include/book.h
index 7dc1ed8c5..5d049ad6c 100644
--- a/include/book.h
+++ b/include/book.h
@@ -59,6 +59,8 @@ class Book
     mutable std::string data;
   };
 
+  typedef std::vector<std::shared_ptr<const Illustration>> Illustrations;
+
  public: // functions
   Book();
   ~Book();
@@ -95,6 +97,8 @@ class Book
   const std::string& getFaviconUrl() const;
   const std::string& getFaviconMimeType() const;
 
+  Illustrations getIllustrations() const;
+
   const std::string& getDownloadId() const { return m_downloadId; }
 
   void setReadOnly(bool readOnly) { m_readOnly = readOnly; }
@@ -142,7 +146,7 @@ class Book
   uint64_t m_mediaCount = 0;
   bool m_readOnly = false;
   uint64_t m_size = 0;
-  std::vector<std::shared_ptr<const Illustration>> m_illustrations;
+  Illustrations m_illustrations;
 
   // Used as the return value of getDefaultIllustration() when no default
   // illustration is found in the book
diff --git a/src/book.cpp b/src/book.cpp
index de82c6fbc..bf7c3e18f 100644
--- a/src/book.cpp
+++ b/src/book.cpp
@@ -47,6 +47,11 @@ Book::~Book()
 {
 }
 
+Book::Illustrations Book::getIllustrations() const
+{
+  return m_illustrations;
+}
+
 bool Book::update(const kiwix::Book& other)
 {
   if (m_readOnly)
diff --git a/src/opds_dumper.cpp b/src/opds_dumper.cpp
index 6897b3142..7d463f714 100644
--- a/src/opds_dumper.cpp
+++ b/src/opds_dumper.cpp
@@ -58,10 +58,10 @@ IllustrationInfo getBookIllustrationInfo(const Book& book)
 {
     kainjow::mustache::list illustrations;
     if ( book.isPathValid() ) {
-      for ( auto illustration_size : zim::Archive(book.getPath()).getIllustrationSizes() ) {
+      for ( const auto& illustration : book.getIllustrations() ) {
         illustrations.push_back(kainjow::mustache::object{
-          {"icon_width", to_string(illustration_size)},
-          {"icon_height", to_string(illustration_size)},
+          {"icon_width", to_string(illustration->width)},
+          {"icon_height", to_string(illustration->height)},
           {"icon_scale", "1"},
         });
       }