diff --git a/Adafruit_ADXL345_U.cpp b/Adafruit_ADXL345_U.cpp
index e9716d0..49e90af 100644
--- a/Adafruit_ADXL345_U.cpp
+++ b/Adafruit_ADXL345_U.cpp
@@ -14,6 +14,13 @@
 
 #include "Adafruit_ADXL345_U.h"
 
+Adafruit_ADXL345_Unified::~Adafruit_ADXL345_Unified() {
+  if (i2c_dev)
+    delete i2c_dev;
+  if (spi_dev)
+    delete spi_dev;
+}
+
 /**************************************************************************/
 /*!
     @brief  Writes one byte to the specified destination register
@@ -146,6 +153,8 @@ Adafruit_ADXL345_Unified::Adafruit_ADXL345_Unified(uint8_t clock, uint8_t miso,
 /**************************************************************************/
 bool Adafruit_ADXL345_Unified::begin(uint8_t i2caddr) {
   if (spi_dev == NULL) {
+    if (i2c_dev)
+      delete i2c_dev;
     i2c_dev = new Adafruit_I2CDevice(i2caddr, &Wire);
     if (!i2c_dev->begin())
       return false;
diff --git a/Adafruit_ADXL345_U.h b/Adafruit_ADXL345_U.h
index c7c900e..35490e0 100644
--- a/Adafruit_ADXL345_U.h
+++ b/Adafruit_ADXL345_U.h
@@ -129,6 +129,7 @@ class Adafruit_ADXL345_Unified : public Adafruit_Sensor {
   Adafruit_ADXL345_Unified(int32_t sensorID = -1);
   Adafruit_ADXL345_Unified(uint8_t clock, uint8_t miso, uint8_t mosi,
                            uint8_t cs, int32_t sensorID = -1);
+  ~Adafruit_ADXL345_Unified();
 
   bool begin(uint8_t addr = ADXL345_DEFAULT_ADDRESS);
   void setRange(range_t range);
diff --git a/library.properties b/library.properties
index ee81644..9f2f577 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=Adafruit ADXL345
-version=1.3.0
+version=1.3.1
 author=Adafruit
 maintainer=Adafruit <info@adafruit.com>
 sentence=Unified driver for the ADXL345 Accelerometer