diff --git a/api/src/FilterLists.Api/FilterLists.Api.csproj b/api/src/FilterLists.Api/FilterLists.Api.csproj
index 987954ede..afe259bc7 100644
--- a/api/src/FilterLists.Api/FilterLists.Api.csproj
+++ b/api/src/FilterLists.Api/FilterLists.Api.csproj
@@ -15,6 +15,7 @@
     <Folder Include="wwwroot\" />
   </ItemGroup>
   <ItemGroup>
+    <PackageReference Include="JetBrains.Annotations" Version="10.4.0" />
     <PackageReference Include="Microsoft.ApplicationInsights.AspNetCore" Version="2.0.0" />
     <PackageReference Include="Microsoft.AspNetCore" Version="1.1.1" />
     <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="1.1.2" />