diff --git a/armsrc/iclass.c b/armsrc/iclass.c
index bfa5fbb47..8028b0ce3 100644
--- a/armsrc/iclass.c
+++ b/armsrc/iclass.c
@@ -809,12 +809,8 @@ int do_iclass_simulation(int simulationMode, uint8_t *reader_mac_buf) {
                 if (memcmp(emulator + (current_page * page_size) + (5 * 8), ff_data, PICOPASS_BLOCK_SIZE) == 0){ //SR card
                     if (block == 16){ //SR cards use a standard legth SIO
                         //update block 6 byte 1 from 03 to A3
-                        uint8_t sr_update[8] = {0};
-                        memcpy(sr_update,emulator + (current_page * page_size) + (6 * 8), PICOPASS_BLOCK_SIZE);
-                        if(sr_update[0] == 0x03){
-                            sr_update[0] = 0xA3;
-                        }
-                        memcpy(emulator + (current_page * page_size) + (6 * 8), sr_update, PICOPASS_BLOCK_SIZE);
+                        uint8_t *sr = emulator + (current_page * page_size) + (6 * 8);
+                        sr[0] |= 0xA0;
                         goto send;
                     }
                 }else{ //For SE cards we have to account for different SIO lengths depending if a standard or custom key is used