diff --git a/armsrc/iclass.c b/armsrc/iclass.c
index 7b4daa36b..56bc29db5 100644
--- a/armsrc/iclass.c
+++ b/armsrc/iclass.c
@@ -1675,7 +1675,8 @@ uint8_t handshakeIclassTag(uint8_t *card_data)
 // Reader iClass Anticollission
 void ReaderIClass(uint8_t arg0) {
 
-	uint8_t card_data[6 * 8]={0xFF};
+	uint8_t card_data[6 * 8]={0};
+	memset(card_data, 0xFF, sizeof(card_data));
     uint8_t last_csn[8]={0};
 	
 	//Read conf block CRC(0x01) => 0xfa 0x22
diff --git a/client/cmdhfmf.c b/client/cmdhfmf.c
index 468243fc5..5f2e8dec3 100644
--- a/client/cmdhfmf.c
+++ b/client/cmdhfmf.c
@@ -434,7 +434,7 @@ int CmdHF14AMfRestore(const char *Cmd)
 {
 	uint8_t sectorNo,blockNo;
 	uint8_t keyType = 0;
-	uint8_t key[6] = {0xFF};
+	uint8_t key[6] = {0xFF,0xFF,0xFF,0xFF,0xFF,0xFF};
 	uint8_t bldata[16] = {0x00};
 	uint8_t keyA[40][6];
 	uint8_t keyB[40][6];