diff --git a/armsrc/mifaredesfire.c b/armsrc/mifaredesfire.c
index 08d7a9379..3530dfd9b 100644
--- a/armsrc/mifaredesfire.c
+++ b/armsrc/mifaredesfire.c
@@ -139,6 +139,7 @@ void MifareDesfireGetInformation(void) {
         uint8_t details[14];
     } PACKED payload;
 
+    memset(&payload, 0x00, sizeof(payload));
     /*
         1 = PCB                 1
         2 = cid                 2