diff --git a/Tapeti.Flow/Tapeti.Flow.csproj b/Tapeti.Flow/Tapeti.Flow.csproj
index dd287a4..a1ad2a6 100644
--- a/Tapeti.Flow/Tapeti.Flow.csproj
+++ b/Tapeti.Flow/Tapeti.Flow.csproj
@@ -12,6 +12,7 @@
     <PackageIcon>Tapeti.Flow.png</PackageIcon>
     <Version>2.0.0</Version>
     <Nullable>enable</Nullable>
+    <DefineConstants>JETBRAINS_ANNOTATIONS</DefineConstants>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
@@ -22,6 +23,10 @@
     <ProjectReference Include="..\Tapeti\Tapeti.csproj" />
   </ItemGroup>
 
+  <ItemGroup>
+    <PackageReference Include="JetBrains.Annotations" Version="2022.*" />
+  </ItemGroup>
+
   <ItemGroup>
     <None Include="..\resources\icons\Tapeti.Flow.png">
       <Pack>True</Pack>
diff --git a/Tapeti/Tapeti.csproj b/Tapeti/Tapeti.csproj
index 7d3a967..664d75d 100644
--- a/Tapeti/Tapeti.csproj
+++ b/Tapeti/Tapeti.csproj
@@ -12,6 +12,7 @@
     <PackageProjectUrl>https://github.com/MvRens/Tapeti</PackageProjectUrl>
     <PackageIcon>Tapeti.png</PackageIcon>
     <Nullable>enable</Nullable>
+    <DefineConstants>JETBRAINS_ANNOTATIONS</DefineConstants>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">