diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 02af7d7013da..e8f581f3f3ce 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -1907,6 +1907,10 @@ void hci_conn_del_sysfs(struct hci_conn *conn);
 #define privacy_mode_capable(dev) (use_ll_privacy(dev) && \
 				   (hdev->commands[39] & 0x04))
 
+#define read_key_size_capable(dev) \
+	((dev)->commands[20] & 0x10 && \
+	 !test_bit(HCI_QUIRK_BROKEN_READ_ENC_KEY_SIZE, &hdev->quirks))
+
 /* Use enhanced synchronous connection if command is supported and its quirk
  * has not been set.
  */
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 4d70402e295f..4a27e4a17a67 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -3218,7 +3218,7 @@ static void hci_conn_complete_evt(struct hci_dev *hdev, void *data,
 			if (key) {
 				set_bit(HCI_CONN_ENCRYPT, &conn->flags);
 
-				if (!(hdev->commands[20] & 0x10)) {
+				if (!read_key_size_capable(hdev)) {
 					conn->enc_key_size = HCI_LINK_KEY_SIZE;
 				} else {
 					cp.handle = cpu_to_le16(conn->handle);
@@ -3666,8 +3666,7 @@ static void hci_encrypt_change_evt(struct hci_dev *hdev, void *data,
 		 * controller really supports it. If it doesn't, assume
 		 * the default size (16).
 		 */
-		if (!(hdev->commands[20] & 0x10) ||
-		    test_bit(HCI_QUIRK_BROKEN_READ_ENC_KEY_SIZE, &hdev->quirks)) {
+		if (!read_key_size_capable(hdev)) {
 			conn->enc_key_size = HCI_LINK_KEY_SIZE;
 			goto notify;
 		}