diff --git a/source/chapter3-fwupdate.rst b/source/chapter3-fwupdate.rst
index 9b1604d31efdb2ac0b53a90ca9426a519c771ac0..e119f55314b3562856976988ded33f7d3c48dcea 100644
--- a/source/chapter3-fwupdate.rst
+++ b/source/chapter3-fwupdate.rst
@@ -39,7 +39,7 @@ EFI_FIRMWARE_IMAGE_DESCRIPTOR as defined in the following table:
    =============================== =============================
    FWU image directory entry field EFI_FIRMWARE_IMAGE_DESCRIPTOR
    =============================== =============================
-   image_uuid                      ImageTypeId
+   img_type_uuid                   ImageTypeId
    lowest_accepted_version         LowestSupportedImageVersion
    last_attempted_version          LastAttemptedVersion
    version                         Version