diff --git a/armsrc/iso14443a.c b/armsrc/iso14443a.c
index 94954222b..1edaad5a6 100644
--- a/armsrc/iso14443a.c
+++ b/armsrc/iso14443a.c
@@ -2759,7 +2759,7 @@ b5,b6 = 00 - DESELECT
 */
 int iso14_apdu(uint8_t *cmd, uint16_t cmd_len, bool send_chaining, void *data, uint8_t *res) {
     uint8_t parity[MAX_PARITY_SIZE] = {0x00};
-    uint8_t real_cmd[cmd_len + 4] = {0x00};
+    uint8_t real_cmd[cmd_len + 4];
 
     if (cmd_len) {
         // ISO 14443 APDU frame: PCB [CID] [NAD] APDU CRC PCB=0x02