diff --git a/src/include/device_tree.h b/src/include/device_tree.h
index e3723c86ac..d9d9613f96 100644
--- a/src/include/device_tree.h
+++ b/src/include/device_tree.h
@@ -52,7 +52,7 @@ struct fdt_header {
 struct fdt_property
 {
 	const char *name;
-	const void *data;
+	void *data;
 	uint32_t size;
 };
 
@@ -165,7 +165,7 @@ void dt_write_int(u8 *dest, u64 src, size_t length);
 void dt_delete_prop(struct device_tree_node *node, const char *name);
 // Add different kinds of properties to a node, or update existing ones.
 void dt_add_bin_prop(struct device_tree_node *node, const char *name,
-		     const void *data, size_t size);
+		     void *data, size_t size);
 void dt_add_string_prop(struct device_tree_node *node, const char *name,
 			const char *str);
 void dt_add_u32_prop(struct device_tree_node *node, const char *name, u32 val);
diff --git a/src/lib/device_tree.c b/src/lib/device_tree.c
index 3c4bd24462..a5021ca8fd 100644
--- a/src/lib/device_tree.c
+++ b/src/lib/device_tree.c
@@ -883,7 +883,7 @@ void dt_delete_prop(struct device_tree_node *node, const char *name)
  * @param size		The size of data in bytes.
  */
 void dt_add_bin_prop(struct device_tree_node *node, const char *name,
-		     const void *data, size_t size)
+		     void *data, size_t size)
 {
 	struct device_tree_property *prop;
 
@@ -955,7 +955,7 @@ void dt_find_bin_prop(const struct device_tree_node *node, const char *name,
 void dt_add_string_prop(struct device_tree_node *node, const char *name,
 			const char *str)
 {
-	dt_add_bin_prop(node, name, str, strlen(str) + 1);
+	dt_add_bin_prop(node, name, (char *)str, strlen(str) + 1);
 }
 
 /*
diff --git a/src/soc/cavium/cn81xx/soc.c b/src/soc/cavium/cn81xx/soc.c
index efe7d6d204..f1e11d335b 100644
--- a/src/soc/cavium/cn81xx/soc.c
+++ b/src/soc/cavium/cn81xx/soc.c
@@ -149,7 +149,7 @@ static void dt_platform_fixup_mac(struct device_tree_node *node)
 		if (*localmac)
 			return;
 		if (used_mac < num_free_mac_addresses) {
-			const u64 genmac = next_free_mac_address + used_mac;
+			u64 genmac = next_free_mac_address + used_mac;
 			dt_add_bin_prop(node, name, &genmac, 6);
 			used_mac++;
 			return;