diff --git a/src/main/msp/msp_serial.h b/src/main/msp/msp_serial.h
index a080408fc7..315e003060 100644
--- a/src/main/msp/msp_serial.h
+++ b/src/main/msp/msp_serial.h
@@ -27,7 +27,9 @@
 #include "msp/msp.h"
 
 // Each MSP port requires state and a receive buffer, revisit this default if someone needs more than 3 MSP ports.
+#ifndef MAX_MSP_PORT_COUNT
 #define MAX_MSP_PORT_COUNT 3
+#endif
 
 typedef enum {
     PORT_IDLE,