diff --git a/tests/extmod_hardware/machine_uart_irq_break.py b/tests/extmod_hardware/machine_uart_irq_break.py
index f255e0f0e6..879f9cee67 100644
--- a/tests/extmod_hardware/machine_uart_irq_break.py
+++ b/tests/extmod_hardware/machine_uart_irq_break.py
@@ -19,18 +19,13 @@ if "esp32" in sys.platform:
     if "ESP32S2" in _machine or "ESP32C3" in _machine or "ESP32C6" in _machine:
         print("SKIP")
         raise SystemExit
-    # ESP32 needs separate UART instances for the test
-    recv_uart_id = 1
-    recv_tx_pin = 14
-    recv_rx_pin = 5
-    send_uart_id = 2
-    send_tx_pin = 4
-    send_rx_pin = 12
+    uart_id = 1
+    tx_pin = 4
+    rx_pin = 5
 elif "rp2" in sys.platform:
-    recv_uart_id = 0
-    send_uart_id = 0
-    recv_tx_pin = "GPIO0"
-    recv_rx_pin = "GPIO1"
+    uart_id = 0
+    tx_pin = "GPIO0"
+    rx_pin = "GPIO1"
 else:
     print("Please add support for this test on this platform.")
     raise SystemExit
@@ -42,22 +37,17 @@ def irq(u):
 
 # Test that the IRQ is called for each break received.
 for bits_per_s in (2400, 9600, 57600):
-    recv_uart = UART(recv_uart_id, bits_per_s, tx=recv_tx_pin, rx=recv_rx_pin)
-    if recv_uart_id != send_uart_id:
-        send_uart = UART(send_uart_id, bits_per_s, tx=send_tx_pin, rx=send_rx_pin)
-    else:
-        send_uart = recv_uart
-
-    recv_uart.irq(irq, recv_uart.IRQ_BREAK)
+    uart = UART(uart_id, bits_per_s, tx=tx_pin, rx=rx_pin)
+    uart.irq(irq, uart.IRQ_BREAK)
 
     print("write", bits_per_s)
     for i in range(3):
-        send_uart.write(str(i))
-        send_uart.flush()
+        uart.write(str(i))
+        uart.flush()
         time.sleep_ms(10)
-        send_uart.sendbreak()
+        uart.sendbreak()
         time.sleep_ms(10)
         if "esp32" in sys.platform:
             # On esp32 a read is needed to read in the break byte.
-            recv_uart.read()
+            uart.read()
     print("done")