diff --git a/t/lib-credential.sh b/t/lib-credential.sh
index 957ae936e8..0c5ff70e19 100755
--- a/t/lib-credential.sh
+++ b/t/lib-credential.sh
@@ -19,6 +19,10 @@ check() {
 		false
 	fi &&
 	test_cmp expect-stdout stdout &&
+	if test_have_prereq MINGW
+	then
+		dos2unix stderr
+	fi &&
 	test_cmp expect-stderr stderr
 }