diff --git a/t/t6406-merge-attr.sh b/t/t6406-merge-attr.sh
index b50aedbc00..9677180a5b 100755
--- a/t/t6406-merge-attr.sh
+++ b/t/t6406-merge-attr.sh
@@ -168,7 +168,7 @@ test_expect_success 'custom merge backend' '
 	rm -f $o $a $b
 '
 
-test_expect_success 'custom merge driver that is killed with a signal' '
+test_expect_success !WINDOWS 'custom merge driver that is killed with a signal' '
 	test_when_finished "rm -f output please-abort" &&
 
 	git reset --hard anchor &&