diff --git a/src/NHibernate/Loader/BasicLoader.cs b/src/NHibernate/Loader/BasicLoader.cs
index 1e2055329cc..2d3ddafd877 100644
--- a/src/NHibernate/Loader/BasicLoader.cs
+++ b/src/NHibernate/Loader/BasicLoader.cs
@@ -62,7 +62,7 @@ protected override void PostInstantiate()
 			// so be careful about how you formulate your queries in this case
 			if (bagCount > 1)
 			{
-				throw new QueryException("Cannot simultaneously fetch multiple bags.");
+				throw new QueryException($"Cannot simultaneously fetch multiple bags: {this}");
 			}
 		}