diff --git a/src/UglyToad.PdfPig/DocumentLayoutAnalysis/DecorationTextBlockClassifier.cs b/src/UglyToad.PdfPig/DocumentLayoutAnalysis/DecorationTextBlockClassifier.cs
index bf3ef550..8c7f0703 100644
--- a/src/UglyToad.PdfPig/DocumentLayoutAnalysis/DecorationTextBlockClassifier.cs
+++ b/src/UglyToad.PdfPig/DocumentLayoutAnalysis/DecorationTextBlockClassifier.cs
@@ -19,10 +19,7 @@ namespace UglyToad.PdfPig.DocumentLayoutAnalysis
     /// </summary>
     public static class DecorationTextBlockClassifier
     {
-        /// <summary>
-        /// 
-        /// </summary>
-        public static Regex numbersPattern = new Regex(@"(\d+)|(\b([MDCLXVI]+)\b)", RegexOptions.IgnoreCase);
+        private static Regex numbersPattern = new Regex(@"(\d+)|(\b([MDCLXVI]+)\b)", RegexOptions.IgnoreCase);
         private static string replacementChar = "@";
 
         /// <summary>