diff --git a/client/src/cmdhfmfdes.c b/client/src/cmdhfmfdes.c
index d4a8b4944..23bd3127a 100644
--- a/client/src/cmdhfmfdes.c
+++ b/client/src/cmdhfmfdes.c
@@ -689,23 +689,22 @@ static int CmdHF14ADesInfo(const char *Cmd) {
     iso14a_card_select_t card;
     res = SelectCard14443A_4(true, false, &card);
     if (res == PM3_SUCCESS) {
-        // convert to str by adding \0 to the end. so we can use strlen() to calc length
-        static const char STANDALONE_DESFIRE[] = { 0x75, 0x77, 0x81, 0x02, '\0' };
-        static const char JCOP_DESFIRE[] = { 0x75, 0xf7, 0xb1, 0x02, '\0' };
-        static const char JCOP3_DESFIRE[] = { 0x78, 0x77, 0x71, 0x02, '\0' };
+        static const uint8_t STANDALONE_DESFIRE[] = { 0x75, 0x77, 0x81, 0x02 };
+        static const uint8_t JCOP_DESFIRE[] = { 0x75, 0xf7, 0xb1, 0x02 };
+        static const uint8_t JCOP3_DESFIRE[] = { 0x78, 0x77, 0x71, 0x02 };
 
         if (card.sak == 0x20) {
 
             if (card.ats_len >= 5) {
-                if (str_startswith((const char *)card.ats + 1, STANDALONE_DESFIRE)) {
+                if (bytes_compare((const uint8_t *)card.ats + 1, STANDALONE_DESFIRE, 4)) {
                     PrintAndLogEx(INFO, "Standalone DESFire");
                 }
-                if (str_startswith((const char *)card.ats + 1, JCOP_DESFIRE)) {
+                if (bytes_compare((const uint8_t *)card.ats + 1, JCOP_DESFIRE, 4)) {
                     PrintAndLogEx(INFO, "JCOP DESFire");
                 }
             }
             if (card.ats_len == 4) {
-                if (str_startswith((const char *)card.ats + 1, JCOP3_DESFIRE)) {
+                if (bytes_compare((const uint8_t *)card.ats + 1, JCOP3_DESFIRE, 4)) {
                     PrintAndLogEx(INFO, "JCOP3 DESFire");
                 }
             }
diff --git a/client/src/util.c b/client/src/util.c
index 65694db18..ff99baaf7 100644
--- a/client/src/util.c
+++ b/client/src/util.c
@@ -505,6 +505,15 @@ void bytes_to_bytebits(const void *src, const size_t srclen, void *dest) {
     }
 }
 
+// Compare two arrays
+bool bytes_compare(const uint8_t *b1, const uint8_t *b2, const size_t n) {
+    for (size_t i = 0; i < n; i++) {
+        if (b1[i] != b2[i])
+            return false;
+    }
+    return true;
+}
+
 // aa,bb,cc,dd,ee,ff,gg,hh, ii,jj,kk,ll,mm,nn,oo,pp
 // to
 // hh,gg,ff,ee,dd,cc,bb,aa, pp,oo,nn,mm,ll,kk,jj,ii
diff --git a/client/src/util.h b/client/src/util.h
index 532f47313..a0b7237c2 100644
--- a/client/src/util.h
+++ b/client/src/util.h
@@ -61,6 +61,7 @@ int hex_to_bytes(const char *hexValue, uint8_t *bytesValue, size_t maxBytesValue
 void num_to_bytebits(uint64_t n, size_t len, uint8_t *dest);
 void num_to_bytebitsLSBF(uint64_t n, size_t len, uint8_t *dest);
 void bytes_to_bytebits(const void *src, const size_t srclen, void *dest);
+bool bytes_compare(const uint8_t *b1, const uint8_t *b2, const size_t n);
 
 // Swap endian on arrays up to 64bytes.
 uint8_t *SwapEndian64(const uint8_t *src, const size_t len, const uint8_t blockSize);