diff --git a/win_build/BOINCGUI.vcproj b/win_build/BOINCGUI.vcproj
index ea91d17c85..3b78c06d36 100644
--- a/win_build/BOINCGUI.vcproj
+++ b/win_build/BOINCGUI.vcproj
@@ -328,6 +328,12 @@
 			</File>
 			<File
 				RelativePath="..\lib\network.C">
+				<FileConfiguration
+					Name="Release|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						CompileAs="2"/>
+				</FileConfiguration>
 				<FileConfiguration
 					Name="Debug|Win32">
 					<Tool