diff --git a/tests/drivers/spi/spi_loopback/testcase.yaml b/tests/drivers/spi/spi_loopback/testcase.yaml
index a69c809..749cebd 100644
--- a/tests/drivers/spi/spi_loopback/testcase.yaml
+++ b/tests/drivers/spi/spi_loopback/testcase.yaml
@@ -2,7 +2,7 @@
   depends_on: spi
   tags: drivers spi
   platform_exclude: seeeduino_xiao serpente arduino_nano_33_iot atsamr21_xpro
-    atsamd21_xpro arduino_zero adafruit_trinket_m0
+    atsamd21_xpro arduino_zero adafruit_trinket_m0 arduino_mkrzero
 tests:
   drivers.spi.loopback:
     harness: ztest
diff --git a/tests/drivers/uart/uart_async_api/testcase.yaml b/tests/drivers/uart/uart_async_api/testcase.yaml
index 9035a11..c7d1a06 100644
--- a/tests/drivers/uart/uart_async_api/testcase.yaml
+++ b/tests/drivers/uart/uart_async_api/testcase.yaml
@@ -2,6 +2,7 @@
   platform_exclude: seeeduino_xiao serpente arduino_nano_33_iot atsamr21_xpro
     adafruit_itsybitsy_m4_express atsame54_xpro atsamd21_xpro adafruit_trinket_m0
     arduino_nano_33_iot arduino_zero atsamd21_xpro adafruit_feather_m0_basic_proto
+    arduino_mkrzero
 
 tests:
   drivers.uart.async_api: