diff --git a/tests/drivers/timer/nrf_grtc_timer/boards/nrf54h20dk_nrf54h20_cpuppr.overlay b/tests/drivers/timer/nrf_grtc_timer/boards/nrf54h20dk_nrf54h20_cpuppr.overlay
new file mode 100644
index 00000000000..d16ef2893e3
--- /dev/null
+++ b/tests/drivers/timer/nrf_grtc_timer/boards/nrf54h20dk_nrf54h20_cpuppr.overlay
@@ -0,0 +1,5 @@
+/* SPDX-License-Identifier: Apache-2.0 */
+
+&grtc {
+	owned-channels = <5 6>;
+};