diff --git a/ILSpy.Tests/ILSpy.Tests.csproj b/ILSpy.Tests/ILSpy.Tests.csproj
index 7115591fb..b0affb98c 100644
--- a/ILSpy.Tests/ILSpy.Tests.csproj
+++ b/ILSpy.Tests/ILSpy.Tests.csproj
@@ -50,6 +50,7 @@
     <PackageReference Include="NUnit3TestAdapter" Version="3.13.0" />
     <PackageReference Include="System.Collections.Immutable" Version="1.5.0" />
     <PackageReference Include="NUnit" Version="3.11.0" />
+    <PackageReference Include="Moq" Version="4.14.1" />
   </ItemGroup>
 
   <ItemGroup>