diff --git a/t/test-lib.sh b/t/test-lib.sh
index 9b61f16..b87a09f 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -1109,6 +1109,10 @@
 	test -n "$GIT_TEST_LONG"
 '
 
+test_lazy_prereq EXPENSIVE_ON_WINDOWS '
+	test_have_prereq EXPENSIVE || test_have_prereq !MINGW,!CYGWIN
+'
+
 test_lazy_prereq USR_BIN_TIME '
 	test -x /usr/bin/time
 '