diff --git a/src/jp2image.cpp b/src/jp2image.cpp
index 9398035e9f..6548de8b8c 100644
--- a/src/jp2image.cpp
+++ b/src/jp2image.cpp
@@ -444,6 +444,7 @@ void Jp2Image::printStructure(std::ostream& out, PrintStructureOption option, si
         case kJp2BoxType::FileTypeBox: {
           // This box shall immediately follow the JPEG 2000 Signature box
           /// \todo  All files shall contain one and only one File Type box.
+          Internal::enforce(box.length >= boxHSize, ErrorCode::kerCorruptedMetadata);
           Blob boxData(box.length - boxHSize);
           io_->readOrThrow(boxData.data(), boxData.size(), ErrorCode::kerCorruptedMetadata);
           if (!Internal::isValidBoxFileType(boxData))