diff --git a/libfreefare/freefare.c b/libfreefare/freefare.c
index 1b3304a..9952bc7 100644
--- a/libfreefare/freefare.c
+++ b/libfreefare/freefare.c
@@ -53,8 +53,8 @@ freefare_tag_new (nfc_device_t *device, nfc_iso14443a_info_t nai)
     for (size_t i = 0; i < sizeof (supported_tags) / sizeof (struct supported_tag); i++) {
 	if (((nai.szUidLen == 4) || (nai.abtUid[0] == NXP_MANUFACTURER_CODE)) &&
 	    (nai.btSak == supported_tags[i].SAK) &&
-	    (!supported_tags[i].ATS_length || (nai.szAtsLen == supported_tags[i].ATS_length) &&
-	    (0 == memcmp (nai.abtAts, supported_tags[i].ATS, ATS_LENGTH)))) {
+	    (!supported_tags[i].ATS_length || ((nai.szAtsLen == supported_tags[i].ATS_length) &&
+	    (0 == memcmp (nai.abtAts, supported_tags[i].ATS, ATS_LENGTH))))) {
 
 	    tag_info = &(supported_tags[i]);
 	    found = true;