diff --git a/include/mifare.h b/include/mifare.h
index 804d6bd78..50bf94861 100644
--- a/include/mifare.h
+++ b/include/mifare.h
@@ -126,7 +126,7 @@ typedef struct {
 //-----------------------------------------------------------------------------
 typedef struct {
     uint8_t atr_len;
-    uint8_t atr[30];
+    uint8_t atr[50];
 } PACKED smart_card_atr_t;
 
 typedef enum SMARTCARD_COMMAND {