diff --git a/samples/drivers/counter/alarm/boards/rzg3s_smarc_r9a08g045s33gbg_cm33.overlay b/samples/drivers/counter/alarm/boards/rzg3s_smarc_r9a08g045s33gbg_cm33.overlay
new file mode 100644
index 00000000000..98bb1332ad8
--- /dev/null
+++ b/samples/drivers/counter/alarm/boards/rzg3s_smarc_r9a08g045s33gbg_cm33.overlay
@@ -0,0 +1,11 @@
+/*
+ * Copyright (c) 2024 Renesas Electronics Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&gtm0 {
+	counter {
+		status = "okay";
+	};
+};
diff --git a/samples/drivers/counter/alarm/src/main.c b/samples/drivers/counter/alarm/src/main.c
index 7a345de8230..d7f577e72c7 100644
--- a/samples/drivers/counter/alarm/src/main.c
+++ b/samples/drivers/counter/alarm/src/main.c
@@ -59,6 +59,8 @@ struct counter_alarm_cfg alarm_cfg;
 #define TIMER DT_NODELABEL(counter0)
 #elif defined(CONFIG_COUNTER_RA_AGT)
 #define TIMER DT_NODELABEL(counter0)
+#elif defined(CONFIG_COUNTER_RENESAS_RZ_GTM)
+#define TIMER DT_INST(0, renesas_rz_gtm_counter)
 #else
 #error Unable to find a counter device node in devicetree
 #endif