diff --git a/source/jail_audio.cpp b/source/jail_audio.cpp
index a34c20e..bcfe9e7 100644
--- a/source/jail_audio.cpp
+++ b/source/jail_audio.cpp
@@ -144,6 +144,7 @@ JA_Music_t *JA_LoadMusic(Uint8* buffer, Uint32 length)
         free(music->output);
         music->output = (short*)cvt.buf;
     }
+    music->length = music->samples * chan * 2;
     music->pos = 0;
     music->state = JA_MUSIC_STOPPED;