diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/since/result-mixed-sign.js b/test/built-ins/Temporal/PlainDateTime/prototype/since/result-mixed-sign.js
new file mode 100644
index 0000000000..f3ad9710e6
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/since/result-mixed-sign.js
@@ -0,0 +1,26 @@
+// Copyright (C) 2024 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.since
+description: >
+  RangeError when inconsistent custom calendar method causes mixed signs of
+  Duration components
+features: [Temporal]
+---*/
+
+// Test case provided by André Bargull
+
+const cal = new (class extends Temporal.Calendar {
+  dateAdd(date, duration, options) {
+    return super.dateAdd(date, duration.negated(), options);
+  }
+})("iso8601");
+
+const one = new Temporal.PlainDateTime(2000, 1, 1, 0, 0, 0, 0, 0, 0, cal);
+const two = new Temporal.PlainDateTime(2020, 5, 10, 12, 12, 0, 0, 0, 0, cal);
+
+assert.throws(RangeError, () => two.since(one, {
+  largestUnit: "years",
+  smallestUnit: "hours"
+}));
diff --git a/test/built-ins/Temporal/PlainDateTime/prototype/until/result-mixed-sign.js b/test/built-ins/Temporal/PlainDateTime/prototype/until/result-mixed-sign.js
new file mode 100644
index 0000000000..a0a00d0723
--- /dev/null
+++ b/test/built-ins/Temporal/PlainDateTime/prototype/until/result-mixed-sign.js
@@ -0,0 +1,26 @@
+// Copyright (C) 2024 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.until
+description: >
+  RangeError when inconsistent custom calendar method causes mixed signs of
+  Duration components
+features: [Temporal]
+---*/
+
+// Test case provided by André Bargull
+
+const cal = new (class extends Temporal.Calendar {
+  dateAdd(date, duration, options) {
+    return super.dateAdd(date, duration.negated(), options);
+  }
+})("iso8601");
+
+const one = new Temporal.PlainDateTime(2000, 1, 1, 0, 0, 0, 0, 0, 0, cal);
+const two = new Temporal.PlainDateTime(2020, 5, 10, 12, 12, 0, 0, 0, 0, cal);
+
+assert.throws(RangeError, () => one.until(two, {
+  largestUnit: "years",
+  smallestUnit: "hours"
+}));