diff --git a/t/t4031-diff-rewrite-binary.sh b/t/t4031-diff-rewrite-binary.sh
index 157ed85a79..a894c60622 100755
--- a/t/t4031-diff-rewrite-binary.sh
+++ b/t/t4031-diff-rewrite-binary.sh
@@ -46,7 +46,7 @@ test_expect_success 'rewrite diff can show binary patch' '
 
 {
 	echo "#!$SHELL_PATH"
-	cat >dump <<'EOF'
+	cat <<'EOF'
 perl -e '$/ = undef; $_ = <>; s/./ord($&)/ge; print $_' < "$1"
 EOF
 } >dump