diff --git a/common/bootm.c b/common/bootm.c
index e2dc164..34f60bb 100644
--- a/common/bootm.c
+++ b/common/bootm.c
@@ -233,7 +233,7 @@
 		return 1;
 	}
 
-	set_working_fdt_addr(images.ft_addr);
+	set_working_fdt_addr((ulong)images.ft_addr);
 
 	return 0;
 }
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;
diff --git a/common/image-fdt.c b/common/image-fdt.c
index e3f06cd..d9e4728 100644
--- a/common/image-fdt.c
+++ b/common/image-fdt.c
@@ -190,7 +190,7 @@
 	*of_flat_tree = of_start;
 	*of_size = of_len;
 
-	set_working_fdt_addr(*of_flat_tree);
+	set_working_fdt_addr((ulong)*of_flat_tree);
 	return 0;
 
 error:
diff --git a/include/fdt_support.h b/include/fdt_support.h
index 1f19fe4..ae5e8a3 100644
--- a/include/fdt_support.h
+++ b/include/fdt_support.h
@@ -100,7 +100,7 @@
  */
 int ft_system_setup(void *blob, bd_t *bd);
 
-void set_working_fdt_addr(void *addr);
+void set_working_fdt_addr(ulong addr);
 int fdt_shrink_to_minimum(void *blob);
 int fdt_increase_size(void *fdt, int add_len);