diff --git a/Source/NetOffice/NetOffice.csproj b/Source/NetOffice/NetOffice.csproj
index 67432ba1e..a4e4cb34c 100644
--- a/Source/NetOffice/NetOffice.csproj
+++ b/Source/NetOffice/NetOffice.csproj
@@ -8,6 +8,7 @@
     <PackageId>NetOfficeFw.Core</PackageId>
     <PackageTags>netoffice netofficefw NetOffice.Core office excel word outlook powerpoint access interop wrapper vsto addin</PackageTags>
     <PackageReadmeFile>README.md</PackageReadmeFile>
+    <SignOutput>true</SignOutput>
   </PropertyGroup>
 
   <Import Project="..\NetOffice.props" />