diff --git a/libmuscle/python/libmuscle/manager/instance_manager.py b/libmuscle/python/libmuscle/manager/instance_manager.py
index 37627891..cde2192d 100644
--- a/libmuscle/python/libmuscle/manager/instance_manager.py
+++ b/libmuscle/python/libmuscle/manager/instance_manager.py
@@ -139,9 +139,11 @@ def start_all(self) -> None:
             stdout_path = idir / 'stdout.txt'
             stderr_path = idir / 'stderr.txt'
 
+            res_req = self._configuration.get_resources(model.name + component.name)
+
             request = InstantiationRequest(
                     instance, program,
-                    self._configuration.resources[model.name + component.name],
+                    res_req,
                     resources, idir, workdir, stdout_path, stderr_path)
             _logger.info(f'Instantiating {instance}')
             self._requests_out.put(request)
diff --git a/libmuscle/python/libmuscle/planner/planner.py b/libmuscle/python/libmuscle/planner/planner.py
index d6a758ad..2fe735b1 100644
--- a/libmuscle/python/libmuscle/planner/planner.py
+++ b/libmuscle/python/libmuscle/planner/planner.py
@@ -3,8 +3,8 @@
 from typing import Dict, Iterable, List, Mapping, Set, Tuple
 
 from ymmsl.v0_2 import (
-        Component, Configuration, Model, MPICoresResReq, MPINodesResReq,
-        Operator, Reference, ResourceRequirements, ThreadedResReq)
+        Component, Configuration, Model, MPICoresResReq,
+        MPINodesResReq, Operator, Reference, ResourceRequirements, ThreadedResReq)
 
 from libmuscle.planner.resources import OnNodeResources, Resources
 from libmuscle.util import instance_indices
@@ -517,13 +517,18 @@ def allocate_all(
         # Analyse model
         root_model = configuration.root_model()
         model = ModelGraph(root_model)
-        requirements = configuration.resources
         programs = configuration.programs
         exclusive = {
                 i for c in model.components() for i in c.instances()
                 if (c.implementation and
                     not programs[c.implementation].can_share_resources)}
 
+        requirements: dict[Reference, ResourceRequirements] = {
+            root_model.name + component.name:
+                configuration.get_resources(root_model.name + component.name)
+            for component in model.components()
+        }
+
         # Allocate
         unallocated_instances = [
                 i for c in model.components() for i in c.instances()]