--- a/statistics.h
+++ b/statistics.h
@@ -21,11 +21,13 @@
 
 #define STATISTICS_BUFFER_STATUS
 #define STATISTICS_DATA_RATE
+#define STATISTICS_RS232_RX_ERROR
 
 extern unsigned short buffer_status;
 extern unsigned long data_rate_sumup;
 extern unsigned long data_rate;
 extern unsigned short data_rate_counter;
+extern unsigned char rs232_rx_errors;
 
 extern void InitStatistics(void);