diff --git a/msbuild/Xamarin.MacDev.Tasks.Core/Tasks/CodesignTaskBase.cs b/msbuild/Xamarin.MacDev.Tasks.Core/Tasks/CodesignTaskBase.cs
index 405cae5ddf55..e020c29e9218 100644
--- a/msbuild/Xamarin.MacDev.Tasks.Core/Tasks/CodesignTaskBase.cs
+++ b/msbuild/Xamarin.MacDev.Tasks.Core/Tasks/CodesignTaskBase.cs
@@ -76,7 +76,9 @@ string GetFullPathToTool ()
 
 		string GetOutputPath (ITaskItem item)
 		{
-			return Path.Combine (StampPath, item.ItemSpec);
+			var path = item.ItemSpec;
+			var app = path.LastIndexOf (".app/");
+			return Path.Combine (StampPath, path.Substring (app + ".app/".Length));
 		}
 
 		bool NeedsCodesign (ITaskItem item)