diff --git a/OpenSim/Simulation/Control/ControlLinearNode.cpp b/OpenSim/Simulation/Control/ControlLinearNode.cpp
index 9f6a701a47..e04d0187c8 100644
--- a/OpenSim/Simulation/Control/ControlLinearNode.cpp
+++ b/OpenSim/Simulation/Control/ControlLinearNode.cpp
@@ -141,10 +141,11 @@ operator=(const ControlLinearNode &aNode)
  * @return True if the times are equal, false otherwise.
  */
 bool ControlLinearNode::
-operator==(const ControlLinearNode &aNode) const
+operator==(const Object &aNode) const
 {
-    if((_t) > aNode._t) return(false);
-    if((_t) < aNode._t) return(false);
+    const auto& node = dynamic_cast<const ControlLinearNode&>(aNode);
+    if((_t) > node._t) return(false);
+    if((_t) < node._t) return(false);
     return(true);
 }
 
@@ -159,9 +160,10 @@ operator==(const ControlLinearNode &aNode) const
  * @return True if the time of this node is less than the time of aNode.
  */
 bool ControlLinearNode::
-operator<(const ControlLinearNode &aNode) const
+operator<(const Object &aNode) const
 {
-    if(_t<aNode._t) return(true);
+    const auto& node = dynamic_cast<const ControlLinearNode&>(aNode);
+    if(node._t) return(true);
     else return(false);
 }
 
diff --git a/OpenSim/Simulation/Control/ControlLinearNode.h b/OpenSim/Simulation/Control/ControlLinearNode.h
index 117ddff650..5cc8eb6313 100644
--- a/OpenSim/Simulation/Control/ControlLinearNode.h
+++ b/OpenSim/Simulation/Control/ControlLinearNode.h
@@ -92,8 +92,8 @@ OpenSim_DECLARE_CONCRETE_OBJECT(ControlLinearNode, Object);
 public:
 #ifndef SWIG
     ControlLinearNode& operator=(const ControlLinearNode &aControl);
-    bool operator==(const ControlLinearNode &aControl) const;
-    bool operator<(const ControlLinearNode &aControl) const;
+    bool operator==(const Object &aControl) const override;
+    bool operator<(const Object &aControl) const override;
 
     friend std::ostream& operator<<(std::ostream &aOut,
         const ControlLinearNode &aControlLinearNode);