diff --git a/libfreefare/freefare_internal.h b/libfreefare/freefare_internal.h
index b67a1ef..e38b3a8 100644
--- a/libfreefare/freefare_internal.h
+++ b/libfreefare/freefare_internal.h
@@ -261,7 +261,6 @@ struct mifare_ultralight_tag {
     /* mifare_ultralight_read() reads 4 pages at a time (wrapping) */
     MifareUltralightPage cache[MIFARE_ULTRALIGHT_MAX_PAGE_COUNT + 3];
     uint8_t cached_pages[MIFARE_ULTRALIGHT_MAX_PAGE_COUNT];
-    bool is_ultralightc;
 };
 
 /*
diff --git a/libfreefare/mifare_ultralight.c b/libfreefare/mifare_ultralight.c
index b0bd95a..2afb212 100644
--- a/libfreefare/mifare_ultralight.c
+++ b/libfreefare/mifare_ultralight.c
@@ -121,7 +121,6 @@ _mifare_ultralightc_tag_new (nfc_device *device, nfc_target target, bool is_ultr
     FreefareTag tag;
 
     if ((tag = malloc (sizeof (struct mifare_ultralight_tag)))) {
-	MIFARE_ULTRALIGHT(tag)->is_ultralightc = is_ultralightc;
 	tag->type = (is_ultralightc) ? MIFARE_ULTRALIGHT_C : MIFARE_ULTRALIGHT;
 	tag->free_tag = mifare_ultralightc_tag_free;
 	tag->device = device;
@@ -351,13 +350,13 @@ mifare_ultralightc_authenticate (FreefareTag tag, const MifareDESFireKey key)
 bool
 is_mifare_ultralight (FreefareTag tag)
 {
-    return !MIFARE_ULTRALIGHT(tag)->is_ultralightc;
+    return tag->type == MIFARE_ULTRALIGHT;
 }
 
 bool
 is_mifare_ultralightc (FreefareTag tag)
 {
-    return MIFARE_ULTRALIGHT(tag)->is_ultralightc;
+    return tag->type == MIFARE_ULTRALIGHT_C;
 }
 
 /*