diff --git a/include/bluetooth/conn.h b/include/bluetooth/conn.h
index e60b0f44b68..b24c825115e 100644
--- a/include/bluetooth/conn.h
+++ b/include/bluetooth/conn.h
@@ -198,7 +198,18 @@ typedef enum {
  *  @return 0 on success or negative error
  */
 int bt_conn_security(struct bt_conn *conn, bt_security_t sec);
-#endif
+
+/** @brief Get encryption key size.
+ *
+ *  This function gets encryption key size.
+ *  If there is no security (encryption) enabled 0 will be returned.
+ *
+ *  @param conn Existing connection object.
+ *
+ *  @return Encryption key size.
+ */
+uint8_t bt_conn_enc_key_size(struct bt_conn *conn);
+#endif /* CONFIG_BLUETOOTH_SMP */
 
 /** Connection callback structure */
 struct bt_conn_cb {
@@ -221,16 +232,5 @@ struct bt_conn_cb {
  */
 void bt_conn_cb_register(struct bt_conn_cb *cb);
 
-/** @brief Get encryption key size.
- *
- *  This function gets encryption key size.
- *  If there is no security (encryption) enabled 0 will be returned.
- *
- *  @param conn Existing connection object.
- *
- *  @return Encryption key size.
- */
-uint8_t bt_conn_enc_key_size(struct bt_conn *conn);
-
 #endif /* CONFIG_BLUETOOTH_CENTRAL || CONFIG_BLUETOOTH_PERIPHERAL */
 #endif /* __BT_CONN_H */
diff --git a/net/bluetooth/conn.c b/net/bluetooth/conn.c
index ffd7147617f..b124ab65f52 100644
--- a/net/bluetooth/conn.c
+++ b/net/bluetooth/conn.c
@@ -100,6 +100,11 @@ static void notify_disconnected(struct bt_conn *conn)
 }
 
 #if defined(CONFIG_BLUETOOTH_SMP)
+uint8_t bt_conn_enc_key_size(struct bt_conn *conn)
+{
+	return conn->keys ? conn->keys->enc_size : 0;
+}
+
 void bt_conn_identity_resolved(struct bt_conn *conn)
 {
 	const bt_addr_le_t *rpa;
@@ -921,11 +926,6 @@ int bt_conn_le_conn_update(struct bt_conn *conn, uint16_t min, uint16_t max,
 	return bt_hci_cmd_send(BT_HCI_OP_LE_CONN_UPDATE, buf);
 }
 
-uint8_t bt_conn_enc_key_size(struct bt_conn *conn)
-{
-	return conn->keys ? conn->keys->enc_size : 0;
-}
-
 struct net_buf *bt_conn_create_pdu(struct nano_fifo *fifo, size_t reserve)
 {
 	size_t head_reserve = reserve + sizeof(struct bt_hci_acl_hdr) +
diff --git a/net/bluetooth/conn_internal.h b/net/bluetooth/conn_internal.h
index cac642f71d1..472c8f209ef 100644
--- a/net/bluetooth/conn_internal.h
+++ b/net/bluetooth/conn_internal.h
@@ -145,6 +145,7 @@ void bt_conn_identity_resolved(struct bt_conn *conn);
 
 /* Notify higher layers that connection security changed */
 void bt_conn_security_changed(struct bt_conn *conn);
+#endif /* CONFIG_BLUETOOTH_SMP */
 
 /* Prepare a PDU to be sent over a connection */
 struct net_buf *bt_conn_create_pdu(struct nano_fifo *fifo, size_t reserve);
@@ -152,8 +153,6 @@ struct net_buf *bt_conn_create_pdu(struct nano_fifo *fifo, size_t reserve);
 /* Initialize connection management */
 int bt_conn_init(void);
 
-#endif /* CONFIG_BLUETOOTH_SMP */
-
 /* Selects based on connecton type right semaphore for ACL packets */
 static inline struct nano_sem *bt_conn_get_pkts(struct bt_conn *conn)
 {