diff --git a/lib/nfc/nfc_device.c b/lib/nfc/nfc_device.c
index dd78e2daf..45d05a55b 100644
--- a/lib/nfc/nfc_device.c
+++ b/lib/nfc/nfc_device.c
@@ -925,7 +925,7 @@ static bool nfc_device_save_mifare_classic_keys(NfcDevice* dev) {
                     flipper_format_write_hex(file, string_get_cstr(temp_str), sec_tr->key_a, 6);
             }
             if(!key_save_success) break;
-            if(FURI_BIT(data->key_a_mask, i)) {
+            if(FURI_BIT(data->key_b_mask, i)) {
                 string_printf(temp_str, "Key B sector %d", i);
                 key_save_success =
                     flipper_format_write_hex(file, string_get_cstr(temp_str), sec_tr->key_b, 6);