diff --git a/usr.sbin/portsnap/portsnap/portsnap.sh b/usr.sbin/portsnap/portsnap/portsnap.sh
index 3dcf618ab53a..501c530acd60 100644
--- a/usr.sbin/portsnap/portsnap/portsnap.sh
+++ b/usr.sbin/portsnap/portsnap/portsnap.sh
@@ -691,6 +691,13 @@ fetch_snapshot() {
 	fetch_index_sanity || return 1
 # Verify the snapshot contents
 	cut -f 2 -d '|' INDEX.new | fetch_snapshot_verify || return 1
+	cut -f 2 -d '|' tINDEX.new INDEX.new | sort -u > files.expected
+	find snap -mindepth 1 | sed -E 's^snap/(.*)\.gz^\1^' | sort > files.snap
+	if ! cmp -s files.expected files.snap; then
+		echo "unexpected files in snapshot."
+		return 1
+	fi
+	rm files.expected files.snap
 	echo "done."
 
 # Move files into their proper locations