diff --git a/client/cmdhflist.c b/client/cmdhflist.c
index dc3d9640..b1bd8a7a 100644
--- a/client/cmdhflist.c
+++ b/client/cmdhflist.c
@@ -377,5 +377,7 @@ bool NestedCheckKey(uint64_t key, TAuthData *ad, uint8_t *cmd, uint8_t cmdsize)
 	memcpy(buf, cmd, cmdsize);
 	mf_crypto1_decrypt(pcs, buf, cmdsize, 0);
 	
+	crypto1_destroy(pcs);
+	
 	return CheckCrc14443(CRC_14443_A, buf, cmdsize);
 }
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