diff --git a/SerialRB.h b/SerialRB.h
index ee244d2..7b6b7b9 100644
--- a/SerialRB.h
+++ b/SerialRB.h
@@ -32,11 +32,7 @@ Boston, MA  02110-1301, USA.
 #include <Arduino.h>
 #endif
 
-#if defined(STM32F105xC) || defined(__MK20DX256__)
 const uint16_t SERIAL_RINGBUFFER_SIZE = 370U;
-#else
-const uint16_t SERIAL_RINGBUFFER_SIZE = 1000U;
-#endif
 
 class CSerialRB {
 public: