diff --git a/src/odr/html_service.cpp b/src/odr/html_service.cpp
index 5a5b9f0b..42b7619d 100644
--- a/src/odr/html_service.cpp
+++ b/src/odr/html_service.cpp
@@ -48,16 +48,11 @@ const HtmlResourceLocator &HtmlFragment::resource_locator() const {
   return m_impl->resource_locator();
 }
 
-HtmlResources HtmlFragment::write_fragment(std::ostream &os) const {
+void HtmlFragment::write_fragment(std::ostream &os,
+                                  HtmlResources &resources) const {
   internal::html::HtmlWriter out(os, config());
 
-  auto internal_resources = m_impl->write_fragment(out);
-
-  HtmlResources resources;
-  for (const auto &[resource, location] : internal_resources) {
-    resources.emplace_back(HtmlResource(resource), location);
-  }
-  return resources;
+  m_impl->write_fragment(out, resources);
 }
 
 HtmlResources HtmlFragment::write_document(std::ostream &os) const {
diff --git a/src/odr/html_service.hpp b/src/odr/html_service.hpp
index 0a89fd3e..e1388b90 100644
--- a/src/odr/html_service.hpp
+++ b/src/odr/html_service.hpp
@@ -57,7 +57,7 @@ class HtmlFragment final {
   [[nodiscard]] const HtmlConfig &config() const;
   [[nodiscard]] const HtmlResourceLocator &resource_locator() const;
 
-  HtmlResources write_fragment(std::ostream &os) const;
+  void write_fragment(std::ostream &os, HtmlResources &resources) const;
 
   HtmlResources write_document(std::ostream &os) const;
 
diff --git a/src/odr/internal/abstract/html_service.hpp b/src/odr/internal/abstract/html_service.hpp
index abacf03d..bc6d6ee1 100644
--- a/src/odr/internal/abstract/html_service.hpp
+++ b/src/odr/internal/abstract/html_service.hpp
@@ -36,7 +36,8 @@ class HtmlFragment {
   [[nodiscard]] virtual const HtmlConfig &config() const = 0;
   [[nodiscard]] virtual const HtmlResourceLocator &resource_locator() const = 0;
 
-  virtual HtmlResources write_fragment(html::HtmlWriter &out) const = 0;
+  virtual void write_fragment(html::HtmlWriter &out,
+                              HtmlResources &resources) const = 0;
 
   virtual HtmlResources write_document(html::HtmlWriter &out) const = 0;
 };
diff --git a/src/odr/internal/html/document.cpp b/src/odr/internal/html/document.cpp
index dbce8d3c..b0b3f491 100644
--- a/src/odr/internal/html/document.cpp
+++ b/src/odr/internal/html/document.cpp
@@ -154,7 +154,7 @@ class HtmlServiceImpl : public HtmlService {
 
     front(m_document, state);
     for (const auto &fragment : fragments()) {
-      fragment->write_fragment(out);
+      fragment->write_fragment(out, resources);
     }
     back(m_document, state);
 
@@ -179,7 +179,7 @@ class HtmlFragmentBase : public HtmlFragment {
     WritingState state(out, config(), resource_locator(), resources);
 
     front(m_document, state);
-    write_fragment(out);
+    write_fragment(out, resources);
     back(m_document, state);
 
     return resources;
@@ -196,9 +196,7 @@ class TextHtmlFragment final : public HtmlFragmentBase {
       : HtmlFragmentBase("document", std::move(document), std::move(config),
                          std::move(resource_locator)) {}
 
-  HtmlResources write_fragment(HtmlWriter &out) const final {
-    HtmlResources resources;
-
+  void write_fragment(HtmlWriter &out, HtmlResources &resources) const final {
     WritingState state(out, config(), resource_locator(), resources);
 
     auto root = m_document.root_element();
@@ -224,8 +222,6 @@ class TextHtmlFragment final : public HtmlFragmentBase {
       translate_children(element.children(), state);
       out.write_element_end("div");
     }
-
-    return resources;
   }
 };
 
@@ -237,14 +233,10 @@ class SlideHtmlFragment final : public HtmlFragmentBase {
                          std::move(resource_locator)),
         m_slide{slide} {}
 
-  HtmlResources write_fragment(HtmlWriter &out) const final {
-    HtmlResources resources;
-
+  void write_fragment(HtmlWriter &out, HtmlResources &resources) const final {
     WritingState state(out, config(), resource_locator(), resources);
 
     html::translate_slide(m_slide, state);
-
-    return resources;
   }
 
 private:
@@ -259,14 +251,10 @@ class SheetHtmlFragment final : public HtmlFragmentBase {
                          std::move(resource_locator)),
         m_sheet{sheet} {}
 
-  HtmlResources write_fragment(HtmlWriter &out) const final {
-    HtmlResources resources;
-
+  void write_fragment(HtmlWriter &out, HtmlResources &resources) const final {
     WritingState state(out, config(), resource_locator(), resources);
 
     translate_sheet(m_sheet, state);
-
-    return resources;
   }
 
 private:
@@ -281,14 +269,10 @@ class PageHtmlFragment final : public HtmlFragmentBase {
                          std::move(resource_locator)),
         m_page{page} {}
 
-  HtmlResources write_fragment(HtmlWriter &out) const final {
-    HtmlResources resources;
-
+  void write_fragment(HtmlWriter &out, HtmlResources &resources) const final {
     WritingState state(out, config(), resource_locator(), resources);
 
     html::translate_page(m_page, state);
-
-    return resources;
   }
 
 private: