diff --git a/applications/main/nfc/plugins/supported_cards/saflok.c b/applications/main/nfc/plugins/supported_cards/saflok.c
index 55edd2efab..1b40d5de8d 100644
--- a/applications/main/nfc/plugins/supported_cards/saflok.c
+++ b/applications/main/nfc/plugins/supported_cards/saflok.c
@@ -62,8 +62,8 @@ void generate_saflok_key(const uint8_t* uid, uint8_t* key) {
     uint8_t carry_sum = 0;
 
     for(int i = KEY_LENGTH - 1; i >= 0; i--, magickal_index--) {
-        uint16_t keysum = temp_key[i] + magic_table[magickal_index];
-        temp_key[i] = (keysum & 0xFF) + carry_sum;
+        uint16_t keysum = temp_key[i] + magic_table[magickal_index] + carry_sum;
+        temp_key[i] = (keysum & 0xFF);
         carry_sum = keysum >> 8;
     }