diff --git a/board/davinci/dv-evm/dv_board.c b/board/davinci/dv-evm/dv_board.c
index 94925ec..604edb5 100644
--- a/board/davinci/dv-evm/dv_board.c
+++ b/board/davinci/dv-evm/dv_board.c
@@ -181,7 +181,7 @@
 			tmp[0] &= buf[i];
 
 		if ((tmp[0] != 0xff) && (getenv("ethaddr") == NULL)) {
-			sprintf((char *)&tmp[0], "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
+			sprintf((char *)&tmp[0], "%02x:%02x:%02x:%02x:%02x:%02x",
 				buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
 			setenv("ethaddr", (char *)&tmp[0]);
 		}
diff --git a/board/davinci/schmoogie/dv_board.c b/board/davinci/schmoogie/dv_board.c
index b15c5f7..9f271a1 100644
--- a/board/davinci/schmoogie/dv_board.c
+++ b/board/davinci/schmoogie/dv_board.c
@@ -228,7 +228,7 @@
 		forceenv("serial#", "FAILED");
 	} else {
 		/* CRC OK, set "serial" env variable */
-		sprintf((char *)&tmp[0], "%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx",
+		sprintf((char *)&tmp[0], "%02x%02x%02x%02x%02x%02x",
 			buf[6], buf[5], buf[4], buf[3], buf[2], buf[1]);
 		forceenv("serial#", (char *)&tmp[0]);
 	}
diff --git a/board/davinci/sonata/dv_board.c b/board/davinci/sonata/dv_board.c
index 7b0a459..99857c4 100644
--- a/board/davinci/sonata/dv_board.c
+++ b/board/davinci/sonata/dv_board.c
@@ -182,7 +182,7 @@
 			tmp[0] &= buf[i];
 
 		if ((tmp[0] != 0xff) && (getenv("ethaddr") == NULL)) {
-			sprintf((char *)&tmp[0], "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
+			sprintf((char *)&tmp[0], "%02x:%02x:%02x:%02x:%02x:%02x",
 				buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
 			setenv("ethaddr", (char *)&tmp[0]);
 		}