diff --git a/board/amcc/redwood/redwood.c b/board/amcc/redwood/redwood.c
index bb7565e..8ca1495 100644
--- a/board/amcc/redwood/redwood.c
+++ b/board/amcc/redwood/redwood.c
@@ -200,12 +200,13 @@
 
 int checkboard(void)
 {
-	char *s = getenv("serial#");
+	char buf[64];
+	int i = getenv_f("serial#", buf, sizeof(buf));
 
 	printf("Board: Redwood - AMCC 460SX Reference Board");
-	if (s != NULL) {
+	if (i > 0) {
 		puts(", serial# ");
-		puts(s);
+		puts(buf);
 	}
 	putc('\n');