diff --git a/windows/netgen.sln b/windows/netgen.sln
index 9c832162..55de48a6 100644
--- a/windows/netgen.sln
+++ b/windows/netgen.sln
@@ -1,6 +1,6 @@
 
-Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 2012
+Microsoft Visual Studio Solution File, Format Version 13.00
+# Visual Studio 2013
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "netgen", "netgen.vcxproj", "{87468946-A594-4101-81A4-A131F35261EF}"
 EndProject
 Global