Index: Ringtoets/Piping/src/Ringtoets.Piping.Primitives/Ringtoets.Piping.Primitives.csproj
===================================================================
diff -u -rbf334f50530164badedba45a78f3aab857ae1bf6 -r49f905d3363336d44ef828259692644dcf5f9edc
--- Ringtoets/Piping/src/Ringtoets.Piping.Primitives/Ringtoets.Piping.Primitives.csproj	(.../Ringtoets.Piping.Primitives.csproj)	(revision bf334f50530164badedba45a78f3aab857ae1bf6)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Primitives/Ringtoets.Piping.Primitives.csproj	(.../Ringtoets.Piping.Primitives.csproj)	(revision 49f905d3363336d44ef828259692644dcf5f9edc)
@@ -46,6 +46,7 @@
     </Reference>
     <Reference Include="System" />
     <Reference Include="System.Core" />
+    <Reference Include="System.Drawing" />
     <Reference Include="System.Numerics" />
   </ItemGroup>
   <ItemGroup>