diff --git a/benchmarks/modules/utils.py b/benchmarks/modules/utils.py
index d47784fc..2e4c6eb7 100644
--- a/benchmarks/modules/utils.py
+++ b/benchmarks/modules/utils.py
@@ -290,6 +290,14 @@ def set_sge_num_slots(self):
             # Set the total number of CPUs to be requested for the SGE scheduler.
             self.extra_resources['mpi'] = {'num_slots': num_tasks * num_cpus_per_task}
 
+    @run_before('compile')
+    def set_isambard_memory(self):
+        # We define the `memory` extra resource, so that we
+        # can use the corresponding resources in the config file.
+        system, partition = self.current_partition.fullname.split(':')
+        if system == "isambard-phase3":
+            self.extra_resources['memory'] = {}
+
     @run_after('setup')
     def setup_build_job_num_cpus(self):
         # When running a build on a compute node, ReFrame by default uses only a
diff --git a/benchmarks/reframe_config.py b/benchmarks/reframe_config.py
index dafcea4f..2898967b 100644
--- a/benchmarks/reframe_config.py
+++ b/benchmarks/reframe_config.py
@@ -434,9 +434,9 @@ def spack_root_to_path():
                     },
                     'resources': [
                         {
-                            'name': 'cpu',
-                             # TODO: memory should be a separate resource.
-                            'options': ['ncpus={num_cpus}:mem=100g'],
+                            'name': 'memory',
+                             # TODO: memory should be a more general resource.
+                            'options': ['mem=100g'],
                         },
                     ],
                 },
@@ -455,6 +455,13 @@ def spack_root_to_path():
                         'num_sockets': 2,
                         'num_cpus_per_socket': 64,
                     },
+                    'resources': [
+                        {
+                            'name': 'memory',
+                             # TODO: memory should be a more general resource.
+                            'options': ['mem=100g'],
+                        },
+                    ],
                 },
             ]
         },  # end Isambard Phase3