diff --git a/src/tests/drivers/sx1278/test-sx1278-serial.cpp b/src/tests/drivers/sx1278/test-sx1278-serial.cpp
index b3f024b2149021dcea26d55785318ef1cb2498eb..11d57549e25b2866d80f3ae0db2fce89f811c3a9 100644
--- a/src/tests/drivers/sx1278/test-sx1278-serial.cpp
+++ b/src/tests/drivers/sx1278/test-sx1278-serial.cpp
@@ -90,7 +90,7 @@ void recvLoop()
 
 void sendLoop()
 {
-    uint8_t msg[256];
+    uint8_t msg[63];
     while (1)
     {
         auto serial = miosix::DefaultConsole::instance().get();