diff --git a/Dfe.Academies.Academisation.Domain/ProjectAggregate/Project.cs b/Dfe.Academies.Academisation.Domain/ProjectAggregate/Project.cs
index b7ae5d786..a1d457ee3 100644
--- a/Dfe.Academies.Academisation.Domain/ProjectAggregate/Project.cs
+++ b/Dfe.Academies.Academisation.Domain/ProjectAggregate/Project.cs
@@ -353,7 +353,8 @@ public CommandResult Update(ProjectDetails detailsToUpdate)
 		return grantAmountChanged switch
 		{
 			true => reason,
-			false => null
+			false => null,
+			_ => reason
 		};
 	}
 }