diff --git a/libavcodec/tta.c b/libavcodec/tta.c
index bcbe037b66..4240946aa2 100644
--- a/libavcodec/tta.c
+++ b/libavcodec/tta.c
@@ -99,7 +99,7 @@ static const int32_t ttafilter_configs[4] = {
 
 static void ttafilter_init(TTAContext *s, TTAFilter *c, int32_t shift) {
     memset(c, 0, sizeof(TTAFilter));
-    if (s->pass) {
+    if (s->format == FORMAT_ENCRYPTED) {
         int i;
         for (i = 0; i < 8; i++)
             c->qm[i] = sign_extend(s->crc_pass[i], 8);