diff --git a/Userland/Libraries/LibPDF/Document.cpp b/Userland/Libraries/LibPDF/Document.cpp
index e25dc0e6a0..5dac546ac5 100644
--- a/Userland/Libraries/LibPDF/Document.cpp
+++ b/Userland/Libraries/LibPDF/Document.cpp
@@ -211,9 +211,8 @@ PDFErrorOr<void> Document::build_outline()
         return {};
 
     auto first_ref = outline_dict->get_value(CommonNames::First);
-    auto last_ref = outline_dict->get_value(CommonNames::Last);
 
-    auto children = TRY(build_outline_item_chain(first_ref, last_ref));
+    auto children = TRY(build_outline_item_chain(first_ref));
 
     m_outline = adopt_ref(*new OutlineDict());
     m_outline->children = move(children);
@@ -273,9 +272,7 @@ PDFErrorOr<NonnullRefPtr<OutlineItem>> Document::build_outline_item(NonnullRefPt
     if (outline_item_dict->contains(CommonNames::First)) {
         VERIFY(outline_item_dict->contains(CommonNames::Last));
         auto first_ref = outline_item_dict->get_value(CommonNames::First);
-        auto last_ref = outline_item_dict->get_value(CommonNames::Last);
-
-        auto children = TRY(build_outline_item_chain(first_ref, last_ref));
+        auto children = TRY(build_outline_item_chain(first_ref));
         outline_item->children = move(children);
     }
 
@@ -326,10 +323,14 @@ PDFErrorOr<NonnullRefPtr<OutlineItem>> Document::build_outline_item(NonnullRefPt
     return outline_item;
 }
 
-PDFErrorOr<NonnullRefPtrVector<OutlineItem>> Document::build_outline_item_chain(Value const& first_ref, Value const& last_ref)
+PDFErrorOr<NonnullRefPtrVector<OutlineItem>> Document::build_outline_item_chain(Value const& first_ref)
 {
+    // We used to receive a last_ref parameter, which was what the parent of this chain
+    // thought was this chain's last child. There are documents out there in the wild
+    // where this cross-references don't match though, and it seems like simply following
+    // the /First and /Next links is the way to go to construct the whole Outline
+    // (we already ignore the /Parent attribute too, which can also be out of sync).
     VERIFY(first_ref.has<Reference>());
-    VERIFY(last_ref.has<Reference>());
 
     NonnullRefPtrVector<OutlineItem> children;
 
@@ -352,8 +353,6 @@ PDFErrorOr<NonnullRefPtrVector<OutlineItem>> Document::build_outline_item_chain(
         current_child_dict = move(next_child_dict);
     }
 
-    VERIFY(last_ref.as_ref_index() == current_child_index);
-
     return children;
 }
 
diff --git a/Userland/Libraries/LibPDF/Document.h b/Userland/Libraries/LibPDF/Document.h
index 99a41aa641..e2968b36bd 100644
--- a/Userland/Libraries/LibPDF/Document.h
+++ b/Userland/Libraries/LibPDF/Document.h
@@ -146,7 +146,7 @@ private:
 
     PDFErrorOr<void> build_outline();
     PDFErrorOr<NonnullRefPtr<OutlineItem>> build_outline_item(NonnullRefPtr<DictObject> const& outline_item_dict);
-    PDFErrorOr<NonnullRefPtrVector<OutlineItem>> build_outline_item_chain(Value const& first_ref, Value const& last_ref);
+    PDFErrorOr<NonnullRefPtrVector<OutlineItem>> build_outline_item_chain(Value const& first_ref);
 
     PDFErrorOr<Destination> create_destination_from_parameters(NonnullRefPtr<ArrayObject>);