diff --git a/src/cpu/o3/O3CPU.py b/src/cpu/o3/O3CPU.py
--- a/src/cpu/o3/O3CPU.py
+++ b/src/cpu/o3/O3CPU.py
@@ -141,6 +141,7 @@
                                      warnOnlyOnLoadError=True)
             self.checker.itb = ArmTLB(size = self.itb.size)
             self.checker.dtb = ArmTLB(size = self.dtb.size)
+            self.checker.cpu_id = self.cpu_id
 
         else:
             print "ERROR: Checker only supported under ARM ISA!"