diff --git a/src/FSharpSource.targets b/src/FSharpSource.targets
index 54071686196..f9e54f501f7 100644
--- a/src/FSharpSource.targets
+++ b/src/FSharpSource.targets
@@ -402,6 +402,12 @@
     <GeneratedFSharpInternalsVisibleToFile>$(IntermediateOutputPath)$(MSBuildProjectName).InternalsVisibleTo$(DefaultLanguageSourceExtension)</GeneratedFSharpInternalsVisibleToFile>
   </PropertyGroup>
 
+  <ItemDefinitionGroup>
+    <InternalsVisibleTo>
+      <Visible>false</Visible>
+    </InternalsVisibleTo>
+  </ItemDefinitionGroup>
+
   <Target Name="PrepareFSharpGenerateInternalsVisibleToFile"
           Condition="'$(Configuration)' != 'Proto' and '@(InternalsVisibleTo)' != ''">
     <PropertyGroup>