diff --git a/boards/silabs/radio_boards/siwx917_rb4338a/siwx917_rb4338a.yaml b/boards/silabs/radio_boards/siwx917_rb4338a/siwx917_rb4338a.yaml
index 4f2f76f6f06..5fb0b7df3f5 100644
--- a/boards/silabs/radio_boards/siwx917_rb4338a/siwx917_rb4338a.yaml
+++ b/boards/silabs/radio_boards/siwx917_rb4338a/siwx917_rb4338a.yaml
@@ -18,4 +18,5 @@ supported:
   - watchdog
   - spi
   - wifi
+  - rtc
 vendor: silabs
diff --git a/tests/drivers/rtc/rtc_api/boards/siwx917_rb4338a.overlay b/tests/drivers/rtc/rtc_api/boards/siwx917_rb4338a.overlay
new file mode 100644
index 00000000000..ba5d4515749
--- /dev/null
+++ b/tests/drivers/rtc/rtc_api/boards/siwx917_rb4338a.overlay
@@ -0,0 +1,15 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Copyright (c) 2025 Silicon Laboratories Inc.
+ */
+
+/ {
+	aliases {
+		rtc = &rtc0;
+	};
+};
+
+&rtc0 {
+	status = "okay";
+};