diff --git a/Adafruit_Sensor.cpp b/Adafruit_Sensor.cpp
index 2977b27..ee59b27 100644
--- a/Adafruit_Sensor.cpp
+++ b/Adafruit_Sensor.cpp
@@ -1,5 +1,2 @@
 #include "Adafruit_Sensor.h"
 #include <avr/pgmspace.h>
-
-void Adafruit_Sensor::constructor() {
-}
diff --git a/Adafruit_Sensor.h b/Adafruit_Sensor.h
index beb51c8..7742afc 100644
--- a/Adafruit_Sensor.h
+++ b/Adafruit_Sensor.h
@@ -139,12 +139,13 @@ typedef struct
 class Adafruit_Sensor {
  public:
   // Constructor(s)
-  void constructor();
+  Adafruit_Sensor() {}
+  virtual ~Adafruit_Sensor() {}
 
   // These must be defined by the subclass
   virtual void enableAutoRange(bool enabled) {};
-  virtual bool getEvent(sensors_event_t*);
-  virtual void getSensor(sensor_t*);
+  virtual bool getEvent(sensors_event_t*) = 0;
+  virtual void getSensor(sensor_t*) = 0;
   
  private:
   bool _autoRange;