diff --git a/lib/nfc/protocols/mf_plus/mf_plus_i.c b/lib/nfc/protocols/mf_plus/mf_plus_i.c
index 32a28bc9d..89bd9dcf7 100644
--- a/lib/nfc/protocols/mf_plus/mf_plus_i.c
+++ b/lib/nfc/protocols/mf_plus/mf_plus_i.c
@@ -172,11 +172,11 @@ bool mf_plus_get_type_from_iso4(const Iso14443_4aData* iso4_data, MfPlusData* mf
             mf_plus_data->type = MfPlusTypeS;
             mf_plus_data->security_level = MfPlusSecurityLevel3;
 
-            if((iso4_data->iso14443_3a_data->atqa[1] & 0x0F) == 0x04) {
+            if((iso4_data->iso14443_3a_data->atqa[0] & 0x0F) == 0x04) {
                 // Mifare Plus S 2K SL3
                 mf_plus_data->size = MfPlusSize2K;
                 FURI_LOG_D(TAG, "Mifare Plus S 2K SL3");
-            } else if((iso4_data->iso14443_3a_data->atqa[1] & 0x0F) == 0x02) {
+            } else if((iso4_data->iso14443_3a_data->atqa[0] & 0x0F) == 0x02) {
                 // Mifare Plus S 4K SL3
                 mf_plus_data->size = MfPlusSize4K;
                 FURI_LOG_D(TAG, "Mifare Plus S 4K SL3");
@@ -194,10 +194,10 @@ bool mf_plus_get_type_from_iso4(const Iso14443_4aData* iso4_data, MfPlusData* mf
             mf_plus_data->type = MfPlusTypeX;
             mf_plus_data->security_level = MfPlusSecurityLevel3;
 
-            if((iso4_data->iso14443_3a_data->atqa[1] & 0x0F) == 0x04) {
+            if((iso4_data->iso14443_3a_data->atqa[0] & 0x0F) == 0x04) {
                 mf_plus_data->size = MfPlusSize2K;
                 FURI_LOG_D(TAG, "Mifare Plus X 2K SL3");
-            } else if((iso4_data->iso14443_3a_data->atqa[1] & 0x0F) == 0x02) {
+            } else if((iso4_data->iso14443_3a_data->atqa[0] & 0x0F) == 0x02) {
                 mf_plus_data->size = MfPlusSize4K;
                 FURI_LOG_D(TAG, "Mifare Plus X 4K SL3");
             } else {