diff --git a/RaiNote.PacketMediator/RaiNote.PacketMediator.csproj b/RaiNote.PacketMediator/RaiNote.PacketMediator.csproj
index 731a71d..117290a 100644
--- a/RaiNote.PacketMediator/RaiNote.PacketMediator.csproj
+++ b/RaiNote.PacketMediator/RaiNote.PacketMediator.csproj
@@ -20,6 +20,7 @@
     <PackageReadmeFile>README.md</PackageReadmeFile>
     <IncludeSymbols>true</IncludeSymbols>
     <SymbolPackageFormat>snupkg</SymbolPackageFormat>
+    <WarningsAsErrors>Nullable</WarningsAsErrors>
   </PropertyGroup>
 
   <ItemGroup>