diff --git a/board/rsdproto/rsdproto.c b/board/rsdproto/rsdproto.c
index 26edb2e..10759b7 100644
--- a/board/rsdproto/rsdproto.c
+++ b/board/rsdproto/rsdproto.c
@@ -26,6 +26,7 @@
 #include <ioports.h>
 #include <mpc8260.h>
 #include <i2c.h>
+#include <bcd.h>
 
 /* define to initialise the SDRAM on the local bus */
 #undef INIT_LOCAL_BUS_SDRAM
@@ -208,16 +209,14 @@
 {
 	unsigned char buffer[8];
 
-#define BCD_TO_BIN(val) ((val)=((val)&15) + ((val)>>4)*10)
-
 	if (! i2c_read (RS5C372_PPC_I2C_ADR, 0, 1, buffer, sizeof (buffer))) {
-		timedate->tm_sec = BCD_TO_BIN (buffer[0]);
-		timedate->tm_min = BCD_TO_BIN (buffer[1]);
-		timedate->tm_hour = BCD_TO_BIN (buffer[2]);
-		timedate->tm_wday = BCD_TO_BIN (buffer[3]);
-		timedate->tm_mday = BCD_TO_BIN (buffer[4]);
-		timedate->tm_mon = BCD_TO_BIN (buffer[5]);
-		timedate->tm_year = BCD_TO_BIN (buffer[6]) + 2000;
+		timedate->tm_sec = bcd2bin (buffer[0]);
+		timedate->tm_min = bcd2bin (buffer[1]);
+		timedate->tm_hour = bcd2bin (buffer[2]);
+		timedate->tm_wday = bcd2bin (buffer[3]);
+		timedate->tm_mday = bcd2bin (buffer[4]);
+		timedate->tm_mon = bcd2bin (buffer[5]);
+		timedate->tm_year = bcd2bin (buffer[6]) + 2000;
 	} else {
 		/*printf("i2c error %02x\n", rc); */
 		memset (timedate, 0, sizeof (struct tm));