diff --git a/utils/mifare.h b/utils/mifare.h
index 3ccf5ae..57d5344 100644
--- a/utils/mifare.h
+++ b/utils/mifare.h
@@ -55,7 +55,7 @@ typedef enum {
 // MIFARE command params
 struct mifare_param_auth {
   uint8_t  abtKey[6];
-  uint8_t  abtUid[4];
+  uint8_t  abtAuthUid[4];
 };
 
 struct mifare_param_data {
diff --git a/utils/nfc-mfclassic.c b/utils/nfc-mfclassic.c
index 97b4fe6..de6ab85 100644
--- a/utils/nfc-mfclassic.c
+++ b/utils/nfc-mfclassic.c
@@ -175,7 +175,7 @@ authenticate(uint32_t uiBlock)
   size_t  key_index;
 
   // Set the authentication information (uid)
-  memcpy(mp.mpa.abtUid, nt.nti.nai.abtUid + nt.nti.nai.szUidLen - 4, 4);
+  memcpy(mp.mpa.abtAuthUid, nt.nti.nai.abtUid + nt.nti.nai.szUidLen - 4, 4);
 
   // Should we use key A or B?
   mc = (bUseKeyA) ? MC_AUTH_A : MC_AUTH_B;