diff --git a/src/UglyToad.PdfPig.Tests/Integration/Documents/PDFBOX-624-2.pdf b/src/UglyToad.PdfPig.Tests/Integration/Documents/PDFBOX-624-2.pdf
new file mode 100644
index 000000000..e28aa07d8
Binary files /dev/null and b/src/UglyToad.PdfPig.Tests/Integration/Documents/PDFBOX-624-2.pdf differ
diff --git a/src/UglyToad.PdfPig/Annotations/AnnotationProvider.cs b/src/UglyToad.PdfPig/Annotations/AnnotationProvider.cs
index 02fc7c4aa..9f7fc5d57 100644
--- a/src/UglyToad.PdfPig/Annotations/AnnotationProvider.cs
+++ b/src/UglyToad.PdfPig/Annotations/AnnotationProvider.cs
@@ -92,9 +92,10 @@ public IEnumerable<Annotation> GetAnnotations()
                     var width = borderArray.GetNumeric(2).Data;
                     var dashes = default(IReadOnlyList<double>);
 
-                    if (borderArray.Length == 4 && borderArray.Data[4] is ArrayToken dashArray)
+                    if (borderArray.Length == 4 && borderArray.Data[3] is ArrayToken dashArray)
                     {
-                        dashes = dashArray.Data.OfType<NumericToken>().Select(x => x.Data).ToList();
+                        // PDFBOX-624-2.pdf
+                        dashes = dashArray.Data.OfType<NumericToken>().Select(x => x.Data).ToArray();
                     }
 
                     border = new AnnotationBorder(horizontal, vertical, width, dashes);