diff --git a/lfs/asterisk b/lfs/asterisk
index 4644b7b37..aa8c85e2b 100644
--- a/lfs/asterisk
+++ b/lfs/asterisk
@@ -36,7 +36,7 @@ PAK_VER    = 4
 
 CHAN_CAPI  = chan_capi-1.0.2
 
-DEPS       = "libpri spandsp"
+DEPS       = "libpri spandsp sox"
 
 ###############################################################################
 # Top-level Rules