diff --git a/src/arch/arm/fastmodel/iris/cpu.cc b/src/arch/arm/fastmodel/iris/cpu.cc
index e5d95ef65c..6c282b69ae 100644
--- a/src/arch/arm/fastmodel/iris/cpu.cc
+++ b/src/arch/arm/fastmodel/iris/cpu.cc
@@ -31,6 +31,7 @@
 
 #include "arch/arm/fastmodel/iris/thread_context.hh"
 #include "scx/scx.h"
+#include "sim/serialize.hh"
 
 namespace Iris
 {
@@ -93,4 +94,10 @@ BaseCPU::init()
         tc->initMemProxies(tc);
 }
 
+void
+BaseCPU::serializeThread(CheckpointOut &cp, ThreadID tid) const
+{
+    ::serialize(*threadContexts[tid], cp);
+}
+
 } // namespace Iris
diff --git a/src/arch/arm/fastmodel/iris/cpu.hh b/src/arch/arm/fastmodel/iris/cpu.hh
index 0d15fc82a4..3b913b92da 100644
--- a/src/arch/arm/fastmodel/iris/cpu.hh
+++ b/src/arch/arm/fastmodel/iris/cpu.hh
@@ -118,6 +118,8 @@ class BaseCPU : public ::BaseCPU
     }
 
     void init() override;
+
+    void serializeThread(CheckpointOut &cp, ThreadID tid) const override;
 };
 
 // This class specializes the one above and sets up ThreadContexts based on