diff --git a/simpeg/dask/objective_function.py b/simpeg/dask/objective_function.py
index f10bc965cd..4b9addd8d7 100644
--- a/simpeg/dask/objective_function.py
+++ b/simpeg/dask/objective_function.py
@@ -72,6 +72,7 @@ def _validate_type_or_future_of_type(
         property_name, objects, obj_type, ensure_unique=True
     )
     workload = [[]]
+    lookup = {}
     count = 0
     for obj in objects:
         if count == len(workers):
@@ -79,7 +80,7 @@ def _validate_type_or_future_of_type(
             workload.append([])
         obj.simulation.simulations[0].worker = workers[count]
         future = client.scatter([obj], workers=workers[count])[0]
-
+        lookup[obj] = (future, workers[count])
         if hasattr(obj, "name"):
             future.name = obj.name
 
@@ -100,7 +101,7 @@ def _validate_type_or_future_of_type(
         raise TypeError(f"{property_name} futures must be an instance of {obj_type}")
 
     if return_workers:
-        return workload, workers
+        return workload, workers, lookup
     else:
         return workload
 
@@ -390,7 +391,7 @@ def objfcts(self):
     def objfcts(self, objfcts):
         client = self.client
 
-        futures, workers = _validate_type_or_future_of_type(
+        futures, workers, lookup = _validate_type_or_future_of_type(
             "objfcts",
             objfcts,
             L2DataMisfit,
@@ -404,8 +405,8 @@ def objfcts(self, objfcts):
         self._workers = workers
 
         self._lookup = {
-            obj.simulation: (future, worker)
-            for future, worker, obj in zip(futures[0], workers, objfcts)
+            misfit.simulation: (future, worker)
+            for misfit, (future, worker) in lookup.items()
         }
 
     def residuals(self, m, f=None):
@@ -443,12 +444,12 @@ def broadcast_updates(self, updates: dict):
             if fun not in self._lookup:
                 continue
 
-            objfct, worker = self._lookup[fun]
+            future, worker = self._lookup[fun]
 
             stores.append(
                 client.submit(
                     _setter_broadcast,
-                    objfct,
+                    future,
                     key,
                     value,
                     workers=worker,