diff --git a/src/ImageSharp/Metadata/Profiles/Exif/ExifReader.cs b/src/ImageSharp/Metadata/Profiles/Exif/ExifReader.cs
index 2eaae2664..9f53bf64c 100644
--- a/src/ImageSharp/Metadata/Profiles/Exif/ExifReader.cs
+++ b/src/ImageSharp/Metadata/Profiles/Exif/ExifReader.cs
@@ -459,7 +459,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Exif
             if (size > 8)
             {
                 ulong newOffset = this.ConvertToUInt64(this.offsetBuffer8);
-                if (newOffset > ulong.MaxValue || (newOffset + size) > (ulong)this.data.Length)
+                if (newOffset > ulong.MaxValue || newOffset > (ulong)(this.data.Length - size))
                 {
                     this.AddInvalidTag(new UnkownExifTag(tag));
                     return;