diff --git a/niflib.vcproj b/niflib.vcproj
index 1abae40c09673dc7c460feb43eaf1eb1fa67bed3..785287628653cd054a2f31a9f79af4c362b4850d 100644
--- a/niflib.vcproj
+++ b/niflib.vcproj
@@ -87,7 +87,7 @@
 			ConfigurationType="4"
 			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
 			CharacterSet="2"
-			WholeProgramOptimization="1"
+			WholeProgramOptimization="0"
 			>
 			<Tool
 				Name="VCPreBuildEventTool"