diff --git a/src/radius/radius.c b/src/radius/radius.c
index 2c01b3f..906d8c8 100644
--- a/src/radius/radius.c
+++ b/src/radius/radius.c
@@ -167,7 +167,7 @@
 	} data_type;
 };
 
-static struct radius_attr_type radius_attrs[] =
+static const struct radius_attr_type radius_attrs[] =
 {
 	{ RADIUS_ATTR_USER_NAME, "User-Name", RADIUS_ATTR_TEXT },
 	{ RADIUS_ATTR_USER_PASSWORD, "User-Password", RADIUS_ATTR_UNDIST },
@@ -259,7 +259,7 @@
 #define RADIUS_ATTRS ARRAY_SIZE(radius_attrs)
 
 
-static struct radius_attr_type *radius_get_attr_type(u8 type)
+static const struct radius_attr_type *radius_get_attr_type(u8 type)
 {
 	size_t i;
 
@@ -274,7 +274,7 @@
 
 static void radius_msg_dump_attr(struct radius_attr_hdr *hdr)
 {
-	struct radius_attr_type *attr;
+	const struct radius_attr_type *attr;
 	int len;
 	unsigned char *pos;
 	char buf[1000];
diff --git a/src/radius/radius_server.c b/src/radius/radius_server.c
index 3f881cf..1c69955 100644
--- a/src/radius/radius_server.c
+++ b/src/radius/radius_server.c
@@ -35,7 +35,7 @@
  */
 #define RADIUS_MAX_MSG_LEN 3000
 
-static struct eapol_callbacks radius_server_eapol_cb;
+static const struct eapol_callbacks radius_server_eapol_cb;
 
 struct radius_client;
 struct radius_server_data;
@@ -2101,7 +2101,7 @@
 #endif /* CONFIG_ERP */
 
 
-static struct eapol_callbacks radius_server_eapol_cb =
+static const struct eapol_callbacks radius_server_eapol_cb =
 {
 	.get_eap_user = radius_server_get_eap_user,
 	.get_eap_req_id_text = radius_server_get_eap_req_id_text,