diff --git a/gtk/gtk.csproj b/gtk/gtk.csproj
index b5279a883..0b3861d17 100644
--- a/gtk/gtk.csproj
+++ b/gtk/gtk.csproj
@@ -943,5 +943,9 @@
       <Project>{42FE871A-D8CF-4B29-9AFF-B02454E6C976}</Project>
       <Name>atk</Name>
     </ProjectReference>
+    <ProjectReference Include="..\cairo\cairo.csproj">
+      <Project>{364577DB-9728-4951-AC2C-EDF7A6FCC09D}</Project>
+      <Name>cairo</Name>
+    </ProjectReference>
   </ItemGroup>
 </Project>