diff --git a/pjlib/build/pjlib_test.dsp b/pjlib/build/pjlib_test.dsp
index 15bf0d2..a9c4175 100644
--- a/pjlib/build/pjlib_test.dsp
+++ b/pjlib/build/pjlib_test.dsp
@@ -123,6 +123,10 @@
 # End Source File
 # Begin Source File
 
+SOURCE="..\src\pjlib-test\ioq_unreg.c"
+# End Source File
+# Begin Source File
+
 SOURCE="..\src\pjlib-test\list.c"
 # End Source File
 # Begin Source File