diff --git a/apps/codecs/atrac3_rm.c b/apps/codecs/atrac3_rm.c
index b666dd4513..997507425e 100644
--- a/apps/codecs/atrac3_rm.c
+++ b/apps/codecs/atrac3_rm.c
@@ -89,7 +89,7 @@ enum codec_status codec_run(void)
     fs = rmctx.audio_framesize;
     sps= rmctx.block_align;
     h = rmctx.sub_packet_h;
-    scrambling_unit_size = h*fs;
+    scrambling_unit_size = h * (fs + PACKET_HEADER_SIZE);
     
     res = atrac3_decode_init(&q, ci->id3);
     if(res < 0) {
diff --git a/apps/codecs/cook.c b/apps/codecs/cook.c
index 5801ee63af..4a47e74f60 100644
--- a/apps/codecs/cook.c
+++ b/apps/codecs/cook.c
@@ -88,7 +88,7 @@ enum codec_status codec_run(void)
     fs = rmctx.audio_framesize;
     sps= rmctx.block_align;
     h = rmctx.sub_packet_h;
-    scrambling_unit_size = h*fs;
+    scrambling_unit_size = h * (fs + PACKET_HEADER_SIZE);
     
     res =cook_decode_init(&rmctx, &q);
     if(res < 0) {
diff --git a/apps/codecs/librm/rm.c b/apps/codecs/librm/rm.c
index 6bc187bb5e..eabbe5d92a 100644
--- a/apps/codecs/librm/rm.c
+++ b/apps/codecs/librm/rm.c
@@ -541,8 +541,9 @@ int rm_get_packet(uint8_t **src,RMContext *rmctx, RMPacket *pkt)
         if (!y)
             rmctx->audiotimestamp = pkt->timestamp;
         
-        advance_buffer(src,12);
-        consumed += 12;
+        /* Skip packet header */
+        advance_buffer(src, PACKET_HEADER_SIZE);
+        consumed += PACKET_HEADER_SIZE;
         if (rmctx->codec_type == CODEC_COOK || rmctx->codec_type == CODEC_ATRAC) {
             for(x = 0 ; x < w/sps; x++)
             {