diff --git a/contrib/lua50/includedirs.vsprops b/contrib/lua50/includedirs.vsprops
index c8aa44d71..6322ff2a4 100644
--- a/contrib/lua50/includedirs.vsprops
+++ b/contrib/lua50/includedirs.vsprops
@@ -1,7 +1,12 @@
-<?xml version="1.0"?>
-<VisualStudioPropertySheet 
-	ProjectType="Visual C++" 
-	Version="8.00" 
+<?xml version="1.0" encoding="Windows-1252"?>
+<VisualStudioPropertySheet
+	ProjectType="Visual C++"
+	Version="8.00"
 	Name="includedirs"
 	>
+	<Tool
+		Name="VCCLCompilerTool"
+		AdditionalIncludeDirectories="&quot;$(ProjectDir)include/&quot;;&quot;$(ProjectDir)src/&quot;"
+		PreprocessorDefinitions="_CRT_SECURE_NO_WARNINGS"
+	/>
 </VisualStudioPropertySheet>