diff --git a/configs/common/CpuConfig.py b/configs/common/CpuConfig.py
index 831287ddcd..0228148d5b 100644
--- a/configs/common/CpuConfig.py
+++ b/configs/common/CpuConfig.py
@@ -70,7 +70,6 @@ def _cpu_subclass_tester(name):
     return tester
 
 is_kvm_cpu = _cpu_subclass_tester("BaseKvmCPU")
-is_atomic_cpu = _cpu_subclass_tester("AtomicSimpleCPU")
 is_noncaching_cpu = _cpu_subclass_tester("NonCachingSimpleCPU")
 
 def get(name):