diff --git a/pjsip-apps/build/samples.dsp b/pjsip-apps/build/samples.dsp
index 1305397..d76f1a0 100644
--- a/pjsip-apps/build/samples.dsp
+++ b/pjsip-apps/build/samples.dsp
@@ -90,6 +90,10 @@
 # End Source File
 # Begin Source File
 
+SOURCE=..\src\samples\auddemo.c
+# End Source File
+# Begin Source File
+
 SOURCE=..\src\samples\confbench.c
 # End Source File
 # Begin Source File