diff --git a/system/i2c/i2c_hexdump.c b/system/i2c/i2c_hexdump.c
index ac3b14cc4..7206c1446 100644
--- a/system/i2c/i2c_hexdump.c
+++ b/system/i2c/i2c_hexdump.c
@@ -126,7 +126,7 @@ void i2ctool_hexdump(FILE *outstream, void *addr, int len)
     {
       /* print address */
 
-      fprintf(outstream, "%08x ", p - (uint8_t *) addr);
+      fprintf(outstream, "%08tx ", p - (uint8_t *) addr);
 
       /* print one line of data */