diff --git a/armsrc/mifaredesfire.c b/armsrc/mifaredesfire.c
index 06a3f3f8c..5b8ed289e 100644
--- a/armsrc/mifaredesfire.c
+++ b/armsrc/mifaredesfire.c
@@ -134,7 +134,7 @@ void MifareDesfireGetInformation() {
         return;
     }
     // add uid.
-    memcpy(payload.uid, card.uid, sizeof(card.uid));
+    memcpy(payload.uid, card.uid, sizeof(payload.uid));
 
     LED_A_ON();
     uint8_t cmd[] = {GET_VERSION, 0x00, 0x00, 0x00};