diff --git a/Makefile b/Makefile
index b318342..c158a5e 100644
--- a/Makefile
+++ b/Makefile
@@ -114,7 +114,7 @@ else
 	if test -t 0 -a -t 1; then TTY=-i; fi; \
 	docker exec $$TTY -t -u ocrd $(CONTAINER) $(SCRIPT) $(<F)/mets.xml
 endif
-	diff -u <(docker run --rm -v $(DATA):/data $(TAGNAME) ocrd workspace -d $(<F) find -G FULLTEXT -g PHYS_0017..PHYS_0021) <(for file in FULLTEXT/FULLTEXT_PHYS_00{17..21}.xml; do echo $(PREFIX)/$$file; done)
+	diff -u <(docker run --rm -v $(DATA):/data $(TAGNAME) ocrd workspace -d $(<F) find -G FULLTEXT -g PHYS_0017..PHYS_0021 -k url) <(for file in FULLTEXT/FULLTEXT_PHYS_00{17..21}.xml; do echo $(PREFIX)/$$file; done)
 
 clean clean-testdata:
 	$(RM) -r $(DATA)/testdata* $(DATA)/ocr-d/testdata*