diff --git a/openttd.dsp b/openttd.dsp
--- a/openttd.dsp
+++ b/openttd.dsp
@@ -538,6 +538,10 @@ SOURCE=.\aystar.h
 # End Source File
 # Begin Source File
 
+SOURCE=.\clear.h
+# End Source File
+# Begin Source File
+
 SOURCE=.\command.h
 # End Source File
 # Begin Source File
@@ -682,6 +686,10 @@ SOURCE=.\rail.h
 # End Source File
 # Begin Source File
 
+SOURCE=.\road.h
+# End Source File
+# Begin Source File
+
 SOURCE=.\saveload.h
 # End Source File
 # Begin Source File
@@ -730,6 +738,10 @@ SOURCE=.\town.h
 # End Source File
 # Begin Source File
 
+SOURCE=.\train.h
+# End Source File
+# Begin Source File
+
 SOURCE=.\variables.h
 # End Source File
 # Begin Source File
@@ -746,6 +758,10 @@ SOURCE=.\viewport.h
 # End Source File
 # Begin Source File
 
+SOURCE=.\void.h
+# End Source File
+# Begin Source File
+
 SOURCE=.\waypoint.h
 # End Source File
 # Begin Source File