diff --git a/src/cpu/CpuCluster.py b/src/cpu/CpuCluster.py
index 31fdc4977d..42a71122a3 100644
--- a/src/cpu/CpuCluster.py
+++ b/src/cpu/CpuCluster.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2022 Arm Limited
+# Copyright (c) 2022-2023 Arm Limited
 # All rights reserved.
 #
 # The license below extends only to copyright in the software and shall
@@ -51,6 +51,9 @@ class CpuCluster(SubSystem):
     def __iter__(self):
         return iter(self.cpus)
 
+    def __len__(self):
+        return len(self.cpus)
+
     def generate_cpus(self, cpu_type: "BaseCPU", num_cpus: int):
         """
         Instantiates the cpus within the cluster provided