diff --git a/Pinta.Docking/Pinta.Docking.csproj b/Pinta.Docking/Pinta.Docking.csproj
index bafe803498..eb8cc80a89 100644
--- a/Pinta.Docking/Pinta.Docking.csproj
+++ b/Pinta.Docking/Pinta.Docking.csproj
@@ -71,6 +71,7 @@
     <Compile Include="DockLibrary\TabStrip.cs" />
     <Compile Include="DockNotebook\DockNotebook.cs" />
     <Compile Include="DockNotebook\DockNotebookContainer.cs" />
+    <Compile Include="DockNotebook\DockNotebookManager.cs" />
     <Compile Include="DockNotebook\DockNotebookTab.cs" />
     <Compile Include="DockNotebook\DockWindow.cs" />
     <Compile Include="DockNotebook\PlaceholderWindow.cs" />