diff --git a/win_build/boinc_guirpc_test.vcproj b/win_build/boinc_guirpc_test.vcproj
index 88a135d48f..5a45e01bbc 100644
--- a/win_build/boinc_guirpc_test.vcproj
+++ b/win_build/boinc_guirpc_test.vcproj
@@ -70,7 +70,8 @@
 			<Tool
 				Name="VCResourceCompilerTool"
 				PreprocessorDefinitions="_DEBUG"
-				Culture="1033"/>
+				Culture="1033"
+				AdditionalIncludeDirectories=".."/>
 			<Tool
 				Name="VCWebServiceProxyGeneratorTool"/>
 			<Tool