diff --git a/armsrc/mifaredesfire.c b/armsrc/mifaredesfire.c
index 736fc1517..64dd6c317 100644
--- a/armsrc/mifaredesfire.c
+++ b/armsrc/mifaredesfire.c
@@ -81,7 +81,7 @@ void MifareSendCommand(uint8_t *datain) {
     } PACKED;
     struct p *payload = (struct p *) datain;
 
-    uint8_t resp[RECEIVE_SIZE];
+    uint8_t resp[MAX_FRAME_SIZE];
     memset(resp, 0, sizeof(resp));
 
     if (g_dbglevel >= DBG_EXTENDED) {
@@ -94,7 +94,7 @@ void MifareSendCommand(uint8_t *datain) {
         clear_trace();
 
     if (payload->flags & INIT) {
-        if (!InitDesfireCard()) {
+        if (InitDesfireCard() == false) {
             return;
         }
     }
@@ -103,7 +103,7 @@ void MifareSendCommand(uint8_t *datain) {
     if (g_dbglevel >= DBG_EXTENDED)
         print_result("RESP <--: ", resp, len);
 
-    if (!len) {
+    if (len == 0) {
         OnError(2);
         return;
     }
@@ -697,7 +697,9 @@ int DesfireAPDU(uint8_t *cmd, size_t cmd_len, uint8_t *dataout) {
 
     len = ReaderReceive(resp, sizeof(resp), par);
     if (len == 0) {
-        if (g_dbglevel >= DBG_EXTENDED) Dbprintf("fukked");
+        if (g_dbglevel >= DBG_EXTENDED) {
+            Dbprintf("Error: data link failed");
+        }
         return false; //DATA LINK ERROR
 
     }