diff --git a/include/asm-sparc/prom.h b/include/asm-sparc/prom.h
index 39ad222..9ea105e 100644
--- a/include/asm-sparc/prom.h
+++ b/include/asm-sparc/prom.h
@@ -35,8 +35,8 @@
 };
 
 struct device_node {
-	char	*name;
-	char	*type;
+	const char	*name;
+	const char	*type;
 	phandle	node;
 	char	*path_component_name;
 	char	*full_name;
diff --git a/include/asm-sparc64/prom.h b/include/asm-sparc64/prom.h
index 6394bd1..ddad5f9 100644
--- a/include/asm-sparc64/prom.h
+++ b/include/asm-sparc64/prom.h
@@ -36,8 +36,8 @@
 
 struct of_irq_controller;
 struct device_node {
-	char	*name;
-	char	*type;
+	const char	*name;
+	const char	*type;
 	phandle	node;
 	char	*path_component_name;
 	char	*full_name;