diff --git a/_config/legacy.yml b/_config/legacy.yml
new file mode 100644
index 0000000..3dedbd4
--- /dev/null
+++ b/_config/legacy.yml
@@ -0,0 +1,5 @@
+SilverStripe\ORM\DatabaseAdmin:
+  classname_value_remapping:
+    BrokenExternalLink: SilverStripe\ExternalLinks\Model\BrokenExternalLink
+    BrokenExternalPageTrack: SilverStripe\ExternalLinks\Model\BrokenExternalPageTrack
+    BrokenExternalPageTrackStatus: SilverStripe\ExternalLinks\Model\BrokenExternalPageTrackStatus