diff --git a/armsrc/iso14443a.c b/armsrc/iso14443a.c
index 612b8333a..b022ae804 100644
--- a/armsrc/iso14443a.c
+++ b/armsrc/iso14443a.c
@@ -2734,6 +2734,7 @@ void DetectNACKbug() {
 		// Receive answer. This will be a 4 Bit NACK when the 8 parity bits are OK after decoding
 		if (ReaderReceive(receivedAnswer, receivedAnswerPar)) {
 			catch_up_cycles = 8; 	// the PRNG is delayed by 8 cycles due to the NAC (4Bits = 0x05 encrypted) transfer	
+			isOK = 1;
 			num_nacks++;
 		} 
 
diff --git a/client/cmdhfmf.c b/client/cmdhfmf.c
index dce2bad26..2f7cc4077 100644
--- a/client/cmdhfmf.c
+++ b/client/cmdhfmf.c
@@ -2856,6 +2856,8 @@ int CmdHf14AMfNack(const char *Cmd) {
 	SendCommand(&c);
 	UsbCommand resp;
 	
+	PrintAndLog("Started testing card for NACK bug");
+	
 	while (true) {
 		
 		printf(".");
@@ -2871,7 +2873,7 @@ int CmdHf14AMfNack(const char *Cmd) {
 			uint32_t nacks = resp.arg[1];
 			uint32_t auths = resp.arg[2];
 			
-			PrintAndLog("Num of sent auth requestes : %u", auths);
+			PrintAndLog("\nNum of sent auth requestes : %u", auths);
 			PrintAndLog("Num of received NACK       : %u", nacks);
 			switch( ok ) {
 				case -1 : PrintAndLog("Button pressed. Aborted."); return 1;