diff --git a/board/esd/du405/du405.c b/board/esd/du405/du405.c
index aa7ee92..e0faa77 100644
--- a/board/esd/du405/du405.c
+++ b/board/esd/du405/du405.c
@@ -163,7 +163,7 @@
 	int index;
 	int len;
 	char str[64];
-	int i = getenv_r ("serial#", str, sizeof (str));
+	int i = getenv_f("serial#", str, sizeof (str));
 
 	puts ("Board: ");