diff --git a/Noisrev.League.IO.RST/RSTFile.cs b/Noisrev.League.IO.RST/RSTFile.cs
index 80ea23d..df86dd9 100644
--- a/Noisrev.League.IO.RST/RSTFile.cs
+++ b/Noisrev.League.IO.RST/RSTFile.cs
@@ -304,7 +304,7 @@ public RSTFile(Stream input, bool leaveOpen) : this()
             }
         }
 
-        private void CheckDuplicate(ulong hash)
+        internal void CheckDuplicate(ulong hash)
         {
             // Check if the entry is already in the list
             if (_entries.Any(e => e.Hash == hash))