diff --git a/src/modules/sound/lullaby/Mpg123Decoder.cpp b/src/modules/sound/lullaby/Mpg123Decoder.cpp
index 62b5925c7..30113feca 100644
--- a/src/modules/sound/lullaby/Mpg123Decoder.cpp
+++ b/src/modules/sound/lullaby/Mpg123Decoder.cpp
@@ -111,6 +111,7 @@ namespace lullaby
 			{
 			case MPG123_NEW_FORMAT:
 				{
+					size += numbytes;
 					long rate = 0;
 					int encoding = 0;
 					int ret = mpg123_getformat(handle, &rate, &channels, &encoding);