diff --git a/src/Xamarin.Android.Build.Tasks/Mono.Android/ApplicationAttribute.Partial.cs b/src/Xamarin.Android.Build.Tasks/Mono.Android/ApplicationAttribute.Partial.cs
index fb14420fb3f..5599a0c2ea4 100644
--- a/src/Xamarin.Android.Build.Tasks/Mono.Android/ApplicationAttribute.Partial.cs
+++ b/src/Xamarin.Android.Build.Tasks/Mono.Android/ApplicationAttribute.Partial.cs
@@ -19,6 +19,7 @@ namespace Android.App {
 	partial class ApplicationAttribute {
 
 		string? _BackupAgent;
+		string? _ManageSpaceActivity;
 		ICustomAttributeProvider? provider;
 
 		ICollection<string>? specified;
@@ -43,8 +44,8 @@ static partial void AddManualMapping ()
 			mapping.Add (
 				member: "ManageSpaceActivity",
 				attributeName: "manageSpaceActivity",
-				getter: self => self.ManageSpaceActivity,
-				setter: (self, value) => self.ManageSpaceActivity = (Type?) value,
+				getter: self => self._ManageSpaceActivity,
+				setter: (self, value) => self._ManageSpaceActivity = (string) value,
 				typeof (Type)
 			);
 			mapping.Add (