diff --git a/expat/Makefile.in b/expat/Makefile.in
index 01d2ab30..76f77b17 100644
--- a/expat/Makefile.in
+++ b/expat/Makefile.in
@@ -181,8 +181,12 @@ run-benchmark: tests/benchmark/benchmark
 	tests/benchmark/benchmark@EXEEXT@ -n $(top_srcdir)/../testdata/largefiles/recset.xml 65535 3
 
 tests/xmlts.zip:
-	wget --output-document=tests/xmlts.zip \
-		https://www.w3.org/XML/Test/xmlts20080827.zip
+	if test "$(XMLTS_ZIP)" = ""; then \
+		wget --output-document=tests/xmlts.zip \
+			https://www.w3.org/XML/Test/xmlts20080827.zip; \
+	else \
+		cp $(XMLTS_ZIP) tests/xmlts.zip; \
+	fi
 
 tests/xmlconf: tests/xmlts.zip
 	cd tests && unzip -q xmlts.zip