diff --git a/projects/openttd_vs80.vcproj b/projects/openttd_vs80.vcproj
index 524141cf3f..5be5963f53 100644
--- a/projects/openttd_vs80.vcproj
+++ b/projects/openttd_vs80.vcproj
@@ -1811,6 +1811,10 @@
 				RelativePath=".\..\src\engine_gui.cpp"
 				>
 			</File>
+			<File
+				RelativePath=".\..\src\fios_gui.cpp"
+				>
+			</File>
 			<File
 				RelativePath=".\..\src\genworld_gui.cpp"
 				>
diff --git a/projects/openttd_vs90.vcproj b/projects/openttd_vs90.vcproj
index 2fb14141ad..a4c4ceb0bb 100644
--- a/projects/openttd_vs90.vcproj
+++ b/projects/openttd_vs90.vcproj
@@ -1808,6 +1808,10 @@
 				RelativePath=".\..\src\engine_gui.cpp"
 				>
 			</File>
+			<File
+				RelativePath=".\..\src\fios_gui.cpp"
+				>
+			</File>
 			<File
 				RelativePath=".\..\src\genworld_gui.cpp"
 				>