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 a7e2a54..d01bca8 100644
--- a/Adafruit_Sensor.h
+++ b/Adafruit_Sensor.h
@@ -140,12 +140,13 @@ 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;
diff --git a/library.properties b/library.properties
new file mode 100644
index 0000000..991b839
--- /dev/null
+++ b/library.properties
@@ -0,0 +1,9 @@
+name=Adafruit Unified Sensor
+version=1.0.0
+author=Adafruit <info@adafruit.com>
+maintainer=Adafruit <info@adafruit.com>
+sentence=Required for all Adafruit Unified Sensor based libraries.
+paragraph=A unified sensor abstraction layer used by many Adafruit sensor libraries.
+category=Sensors
+url=https://github.com/adafruit/Adafruit_Sensor
+architectures=*