diff --git a/VisualStudio/osgTerrain/osgTerrain.dsp b/VisualStudio/osgTerrain/osgTerrain.dsp
index df2f48ec6..f210f6657 100644
--- a/VisualStudio/osgTerrain/osgTerrain.dsp
+++ b/VisualStudio/osgTerrain/osgTerrain.dsp
@@ -171,6 +171,10 @@ SOURCE=..\..\src\osgTerrain\TerrainTechnique.cpp
 # End Source File
 # Begin Source File
 
+SOURCE=..\..\src\osgTerrain\GeometryTechnique.cpp
+# End Source File
+# Begin Source File
+
 SOURCE=..\..\src\osgTerrain\Version.cpp
 # End Source File
 # End Group
@@ -199,6 +203,10 @@ SOURCE=..\..\include\osgTerrain\TerrainTechnique
 # End Source File
 # Begin Source File
 
+SOURCE=..\..\include\osgTerrain\GeometryTechnique
+# End Source File
+# Begin Source File
+
 SOURCE=..\..\include\osgTerrain\Version
 # End Source File
 # End Group