diff --git a/openttd.vcproj b/openttd.vcproj
index 1692471be4..955b0e90e8 100644
--- a/openttd.vcproj
+++ b/openttd.vcproj
@@ -486,6 +486,9 @@
 			<File
 				RelativePath="StdAfx.h">
 			</File>
+			<File
+				RelativePath=".\string.h">
+			</File>
 			<File
 				RelativePath=".\tile.h">
 			</File>