diff --git a/SparkleShare/Mac/SparkleShare.csproj b/SparkleShare/Mac/SparkleShare.csproj
index e7665eef..be222c5e 100644
--- a/SparkleShare/Mac/SparkleShare.csproj
+++ b/SparkleShare/Mac/SparkleShare.csproj
@@ -89,6 +89,7 @@
     <Compile Include="SparkleAbout.cs" />
     <Compile Include="SparkleAlert.cs" />
     <Compile Include="SparkleBubble.cs" />
+    <Compile Include="SparkleMacWatcher.cs" />
   </ItemGroup>
   <ItemGroup>
     <Page Include="MainMenu.xib" />