diff --git a/windows/libyss7.dsp b/windows/libyss7.dsp
index 74dff495..c3b524ba 100644
--- a/windows/libyss7.dsp
+++ b/windows/libyss7.dsp
@@ -87,6 +87,10 @@ LIB32=link.exe -lib
 # PROP Default_Filter "cpp;c;cxx;rc;def;r;odl;idl;hpj;bat"
 # Begin Source File
 
+SOURCE=..\contrib\yss7\address.cpp
+# End Source File
+# Begin Source File
+
 SOURCE=..\contrib\yss7\engine.cpp
 # End Source File
 # Begin Source File