diff --git a/src/UglyToad.PdfPig.Tests/PublicApiScannerTests.cs b/src/UglyToad.PdfPig.Tests/PublicApiScannerTests.cs
index 63db494b..3fc4bfd0 100644
--- a/src/UglyToad.PdfPig.Tests/PublicApiScannerTests.cs
+++ b/src/UglyToad.PdfPig.Tests/PublicApiScannerTests.cs
@@ -236,6 +236,7 @@
                 "UglyToad.PdfPig.Tokens.ObjectToken",
                 "UglyToad.PdfPig.Tokens.StreamToken",
                 "UglyToad.PdfPig.Tokens.StringToken",
+                "UglyToad.PdfPig.Util.Adler32Checksum",
                 "UglyToad.PdfPig.Util.IWordExtractor",
                 "UglyToad.PdfPig.Util.DefaultWordExtractor",
                 "UglyToad.PdfPig.Writer.PdfDocumentBuilder",