diff --git a/Adafruit_MLX90632.cpp b/Adafruit_MLX90632.cpp
index a28605e..ea0bb53 100644
--- a/Adafruit_MLX90632.cpp
+++ b/Adafruit_MLX90632.cpp
@@ -25,6 +25,7 @@
 Adafruit_MLX90632::Adafruit_MLX90632() {
   TO0 = 25.0; // Initialize previous object temperature
   TA0 = 25.0; // Initialize previous ambient temperature
+  i2c_dev = nullptr;
 }
 
 /*!
@@ -694,4 +695,4 @@ double Adafruit_MLX90632::getObjectTemperature() {
  */
 uint16_t Adafruit_MLX90632::swapBytes(uint16_t value) {
   return (value << 8) | (value >> 8);
-}
\ No newline at end of file
+}