diff --git a/build/win32/vs9/gtk-build-defines.vsprops b/build/win32/vs9/gtk-build-defines.vsprops
index 35d614d303..5f12fd795a 100644
--- a/build/win32/vs9/gtk-build-defines.vsprops
+++ b/build/win32/vs9/gtk-build-defines.vsprops
@@ -12,6 +12,7 @@
 		AdditionalIncludeDirectories="..\..\..;$(GlibEtcInstallRoot)\lib\glib-2.0\include;$(GlibEtcInstallRoot)\include\glib-2.0;$(GlibEtcInstallRoot)\include;$(GlibEtcInstallRoot)\include\cairo;$(GlibEtcInstallRoot)\include\atk-1.0;$(GlibEtcInstallRoot)\include\pango-1.0;$(GlibEtcInstallRoot)\include\gdk-pixbuf-2.0"
 		PreprocessorDefinitions="HAVE_CONFIG_H;G_DISABLE_SINGLE_INCLUDES;ATK_DISABLE_SINGLE_INCLUDES;GDK_PIXBUF_DISABLE_SINGLE_INCLUDES;GTK_DISABLE_SINGLE_INCLUDES"
 		ForcedIncludeFiles="msvc_recommended_pragmas.h"
+		AdditionalOptions="/MP"
 	/>
 	<Tool
 		Name="VCLinkerTool"