diff --git a/client/src/mifare/desfirecrypto.h b/client/src/mifare/desfirecrypto.h
index 8611f7ffd..6495f7a6b 100644
--- a/client/src/mifare/desfirecrypto.h
+++ b/client/src/mifare/desfirecrypto.h
@@ -64,7 +64,7 @@ typedef struct {
     uint8_t key[DESFIRE_MAX_KEY_SIZE];
     uint8_t masterKey[DESFIRE_MAX_KEY_SIZE]; // source for kdf
 
-    // KDF finction
+    // KDF function
     uint8_t kdfAlgo;
     uint8_t kdfInputLen;
     uint8_t kdfInput[31];