diff --git a/src/Dax.Formatter/AssemblyInfo.cs b/src/Dax.Formatter/AssemblyInfo.cs
index 4ed6afd..1293ec8 100644
--- a/src/Dax.Formatter/AssemblyInfo.cs
+++ b/src/Dax.Formatter/AssemblyInfo.cs
@@ -1,4 +1,9 @@
 using System.Runtime.CompilerServices;
 
+#if SIGNED
+[assembly: InternalsVisibleTo("Dax.Formatter.Tests, PublicKey=0024000004800000940000000602000000240000525341310004000001000100d1aa2171c79e736b0fbb1638d667e2a4d04e72f2817328e9d31e211d2f7291cef9cbf0321ed2af5c73d6d7fcf375c5641232285b15b9cf3a42e98f9c5f0e2e4726ea0a60d458892f48b395909997fa92a4fa9f8c4da3c056cddecff7e627dc3eb63187c92912a6fb43783e672d9552c0dc05ca446e6c0bd5b0dcd4b47973fbbc")]
+#else
 [assembly: InternalsVisibleTo("Dax.Formatter.Tests")]
+#endif
+
 [assembly: CLSCompliant(true)]
diff --git a/src/Dax.Formatter/Dax.Formatter.csproj b/src/Dax.Formatter/Dax.Formatter.csproj
index 26fd0e4..acd1aac 100644
--- a/src/Dax.Formatter/Dax.Formatter.csproj
+++ b/src/Dax.Formatter/Dax.Formatter.csproj
@@ -43,9 +43,5 @@
     <AssemblyTitle>Dax.Formatter .NET 10.0</AssemblyTitle>
   </PropertyGroup>
 
-  <PropertyGroup Condition="Exists('$(MSBuildThisFileDirectory)DaxFormatter.snk')">
-    <SignAssembly>true</SignAssembly>
-    <AssemblyOriginatorKeyFile>$(MSBuildThisFileDirectory)DaxFormatter.snk</AssemblyOriginatorKeyFile>
-  </PropertyGroup>
 
 </Project>
diff --git a/src/Directory.Build.props b/src/Directory.Build.props
index f2a1eb4..cd843bb 100644
--- a/src/Directory.Build.props
+++ b/src/Directory.Build.props
@@ -13,6 +13,12 @@
     <ContinuousIntegrationBuild>true</ContinuousIntegrationBuild>
   </PropertyGroup>
 
+  <PropertyGroup Condition="Exists('$(MSBuildThisFileDirectory)Dax.Formatter\DaxFormatter.snk')">
+    <DefineConstants>$(DefineConstants);SIGNED</DefineConstants>
+    <SignAssembly>true</SignAssembly>
+    <AssemblyOriginatorKeyFile>$(MSBuildThisFileDirectory)Dax.Formatter\DaxFormatter.snk</AssemblyOriginatorKeyFile>
+  </PropertyGroup>
+
   <ItemGroup>
     <PackageReference Include="Nerdbank.GitVersioning" Version="3.9.50" PrivateAssets="all" />
   </ItemGroup>