diff --git a/tests/periman/periman.ino b/tests/periman/periman.ino
index 9828e236d22..e5ab26a77e4 100644
--- a/tests/periman/periman.ino
+++ b/tests/periman/periman.ino
@@ -52,7 +52,7 @@ void onReceive_cb(void) {
 void setUp(void) {
   log_v("Setting up next test");
   Serial1.setPins(uart1_rx_pin, uart1_tx_pin);
-  uart_internal_loopback(1, RX1);
+  uart_internal_loopback(1, uart1_rx_pin);
   delay(100);
   log_v("Running test");
 }
@@ -66,7 +66,7 @@ void tearDown(void) {
     Serial1.flush();
 
     Serial1.setPins(uart1_rx_pin, uart1_tx_pin);
-    uart_internal_loopback(1, RX1);
+    uart_internal_loopback(1, uart1_rx_pin);
     delay(100);
     test_executed = false;
   }
@@ -234,7 +234,7 @@ void setup() {
   Serial1.begin(115200);
   while(!Serial1) { delay(10); }
   Serial1.onReceive(onReceive_cb);
-  uart_internal_loopback(1, RX1);
+  uart_internal_loopback(1, uart1_rx_pin);
 
   UNITY_BEGIN();