diff --git a/src/Windows/Perspex.Designer/Perspex.Designer.csproj b/src/Windows/Perspex.Designer/Perspex.Designer.csproj
index f415b0af8a..5c227e4a8f 100644
--- a/src/Windows/Perspex.Designer/Perspex.Designer.csproj
+++ b/src/Windows/Perspex.Designer/Perspex.Designer.csproj
@@ -36,6 +36,12 @@
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
   </PropertyGroup>
+  <PropertyGroup>
+    <SignAssembly>true</SignAssembly>
+  </PropertyGroup>
+  <PropertyGroup>
+    <AssemblyOriginatorKeyFile>perspex.designer.snk</AssemblyOriginatorKeyFile>
+  </PropertyGroup>
   <ItemGroup>
     <Reference Include="PresentationCore" />
     <Reference Include="PresentationFramework" />
@@ -80,6 +86,7 @@
   </ItemGroup>
   <ItemGroup>
     <None Include="App.config" />
+    <None Include="perspex.designer.snk" />
   </ItemGroup>
   <ItemGroup>
     <Page Include="App.xaml">
diff --git a/src/Windows/Perspex.Designer/perspex.designer.snk b/src/Windows/Perspex.Designer/perspex.designer.snk
new file mode 100644
index 0000000000..68df1b6e88
Binary files /dev/null and b/src/Windows/Perspex.Designer/perspex.designer.snk differ