diff --git a/tests/drivers/rtc/rtc_api/boards/xmc45_relax_kit.conf b/tests/drivers/rtc/rtc_api/boards/xmc45_relax_kit.conf
new file mode 100644
index 00000000000..92b54777cc0
--- /dev/null
+++ b/tests/drivers/rtc/rtc_api/boards/xmc45_relax_kit.conf
@@ -0,0 +1,3 @@
+CONFIG_RTC_UPDATE=y
+CONFIG_RTC_ALARM=y
+CONFIG_TEST_RTC_ALARM_TIME_MASK=63
diff --git a/tests/drivers/rtc/rtc_api/boards/xmc47_relax_kit.conf b/tests/drivers/rtc/rtc_api/boards/xmc47_relax_kit.conf
new file mode 100644
index 00000000000..92b54777cc0
--- /dev/null
+++ b/tests/drivers/rtc/rtc_api/boards/xmc47_relax_kit.conf
@@ -0,0 +1,3 @@
+CONFIG_RTC_UPDATE=y
+CONFIG_RTC_ALARM=y
+CONFIG_TEST_RTC_ALARM_TIME_MASK=63