diff --git a/sc2/src/msvc++/UrQuanMasters.dsp b/sc2/src/msvc++/UrQuanMasters.dsp
index f90af92e5..2e9ac7591 100644
--- a/sc2/src/msvc++/UrQuanMasters.dsp
+++ b/sc2/src/msvc++/UrQuanMasters.dsp
@@ -588,6 +588,10 @@ SOURCE=..\sc2code\libs\sound\mixsdl\mixer.h
 # End Source File
 # Begin Source File
 
+SOURCE=..\sc2code\libs\sound\mixsdl\mixerint.h
+# End Source File
+# Begin Source File
+
 SOURCE=..\sc2code\libs\sound\mixsdl\sound_mixsdl.c
 # End Source File
 # Begin Source File