diff --git a/pjmedia/build/pjmedia.dsp b/pjmedia/build/pjmedia.dsp
index db23940..aa127e7 100644
--- a/pjmedia/build/pjmedia.dsp
+++ b/pjmedia/build/pjmedia.dsp
@@ -229,6 +229,10 @@
 # End Source File
 # Begin Source File
 
+SOURCE=..\src\pjmedia\sound_legacy.c
+# End Source File
+# Begin Source File
+
 SOURCE=..\src\pjmedia\sound_port.c
 # End Source File
 # Begin Source File