diff --git a/src/UglyToad.PdfPig/Tokenization/Scanner/PdfTokenScanner.cs b/src/UglyToad.PdfPig/Tokenization/Scanner/PdfTokenScanner.cs
index 929dbbd9..75c38ae9 100644
--- a/src/UglyToad.PdfPig/Tokenization/Scanner/PdfTokenScanner.cs
+++ b/src/UglyToad.PdfPig/Tokenization/Scanner/PdfTokenScanner.cs
@@ -195,7 +195,7 @@
                     }
                 
                     // This should never happen.
-                    Debug.Assert(false, "Encountered a '{' operator before the end of the previous object.");
+                    Debug.Assert(false, $"Encountered a '{coreTokenScanner.CurrentToken}' operator before the end of the previous object.");
                     return false;
                 }