diff --git a/common/cmd_fdt.c b/common/cmd_fdt.c
index 682b655..4c18962 100644
--- a/common/cmd_fdt.c
+++ b/common/cmd_fdt.c
@@ -45,7 +45,7 @@ void set_working_fdt_addr(ulong addr)
 
 	buf = map_sysmem(addr, 0);
 	working_fdt = buf;
-	setenv_ulong("fdtaddr", addr);
+	setenv_hex("fdtaddr", addr);
 }
 
 /*