diff --git a/visualc/dosbox.dsp b/visualc/dosbox.dsp
index 58c2e78a..a901901d 100644
--- a/visualc/dosbox.dsp
+++ b/visualc/dosbox.dsp
@@ -546,6 +546,10 @@ SOURCE=..\src\ints\bios_keyboard.cpp
 # End Source File
 # Begin Source File
 
+SOURCE=..\src\ints\dpmi.cpp
+# End Source File
+# Begin Source File
+
 SOURCE=..\src\ints\ems.cpp
 # End Source File
 # Begin Source File