diff --git a/common/cmd_fdt.c b/common/cmd_fdt.c
index dc59fab..5878496 100644
--- a/common/cmd_fdt.c
+++ b/common/cmd_fdt.c
@@ -38,13 +38,13 @@
  */
 struct fdt_header *working_fdt;
 
-void set_working_fdt_addr(void *addr)
+void set_working_fdt_addr(ulong addr)
 {
 	void *buf;
 
-	buf = map_sysmem((ulong)addr, 0);
+	buf = map_sysmem(addr, 0);
 	working_fdt = buf;
-	setenv_addr("fdtaddr", addr);
+	setenv_ulong("fdtaddr", addr);
 }
 
 /*
@@ -123,7 +123,7 @@
 		if (control)
 			gd->fdt_blob = blob;
 		else
-			set_working_fdt_addr((void *)blob);
+			set_working_fdt_addr(addr);
 
 		if (argc >= 2) {
 			int  len;