diff --git a/AK/UUID.h b/AK/UUID.h
index 25e70aec1d..f547deb3d3 100644
--- a/AK/UUID.h
+++ b/AK/UUID.h
@@ -32,7 +32,6 @@ public:
 
 private:
     void convert_string_view_to_uuid(const StringView&);
-    void fill_buffer(ByteBuffer);
 
     Array<u8, 16> m_uuid_buffer {};
 };