diff --git a/pid/controller.hpp b/pid/controller.hpp
index fa89ad1..4220e07 100644
--- a/pid/controller.hpp
+++ b/pid/controller.hpp
@@ -17,6 +17,7 @@
     public:
         PIDController(const std::string& id, ZoneInterface* owner)
             : _owner(owner),
+              _setpoint(0),
               _id(id)
         { }