diff --git a/src/sim/ClockedObject.py b/src/sim/ClockedObject.py
index c8bf809..2d61718 100644
--- a/src/sim/ClockedObject.py
+++ b/src/sim/ClockedObject.py
@@ -67,7 +67,7 @@
     clk_domain = Param.ClockDomain(Parent.clk_domain, "Clock domain")
 
     # Power model for this ClockedObject
-    power_model = Param.PowerModel(NULL, "Power model")
+    power_model = VectorParam.PowerModel([], "Power models")
 
     # Provide initial power state, should ideally get redefined in startup
     # routine
diff --git a/src/sim/clocked_object.cc b/src/sim/clocked_object.cc
index f1e3134..5638911 100644
--- a/src/sim/clocked_object.cc
+++ b/src/sim/clocked_object.cc
@@ -49,8 +49,8 @@
     prvEvalTick(0)
 {
     // Register the power_model with the object
-    if (p->power_model)
-        p->power_model->setClockedObject(this);
+    for (auto & power_model: p->power_model)
+        power_model->setClockedObject(this);
 }
 
 void