diff --git a/Userland/Libraries/LibPDF/Parser.cpp b/Userland/Libraries/LibPDF/Parser.cpp
index d553589466..3892576c4c 100644
--- a/Userland/Libraries/LibPDF/Parser.cpp
+++ b/Userland/Libraries/LibPDF/Parser.cpp
@@ -39,6 +39,11 @@ Parser::Parser(ReadonlyBytes const& bytes)
 {
 }
 
+void Parser::set_document(RefPtr<Document> const& document)
+{
+    m_document = document;
+}
+
 bool Parser::initialize()
 {
     if (!parse_header())
diff --git a/Userland/Libraries/LibPDF/Parser.h b/Userland/Libraries/LibPDF/Parser.h
index 2dba1a0515..ac8aa3ff8f 100644
--- a/Userland/Libraries/LibPDF/Parser.h
+++ b/Userland/Libraries/LibPDF/Parser.h
@@ -29,7 +29,7 @@ public:
     Parser(Badge<Document>, ReadonlyBytes const&);
 
     [[nodiscard]] ALWAYS_INLINE RefPtr<DictObject> const& trailer() const { return m_trailer; }
-    void set_document(RefPtr<Document> const& document) { m_document = document; }
+    void set_document(RefPtr<Document> const&);
 
     // Parses the header and initializes the xref table and trailer
     bool initialize();