diff --git a/PCF8574.cpp b/PCF8574.cpp
index 4c91bf3..81701e9 100644
--- a/PCF8574.cpp
+++ b/PCF8574.cpp
@@ -12,14 +12,8 @@
 
 
 PCF8574::PCF8574(const uint8_t deviceAddress, TwoWire *wire)
-{
-  _address    = deviceAddress;
-  _wire       = wire;
-  _dataIn     = 0;
-  _dataOut    = 0xFF;
-  _buttonMask = 0xFF;
-  _error      = PCF8574_OK;
-}
+: _address {deviceAddress}, _wire {wire}
+{}
 
 
 bool PCF8574::begin(uint8_t value)
diff --git a/PCF8574.h b/PCF8574.h
index 96c5bb6..a3d91f9 100644
--- a/PCF8574.h
+++ b/PCF8574.h
@@ -78,11 +78,12 @@ class PCF8574
 
 
 private:
+  int     _error {PCF8574_OK};
   uint8_t _address;
-  uint8_t _dataIn;
-  uint8_t _dataOut;
-  uint8_t _buttonMask;
-  int     _error;
+  uint8_t _dataIn {0};
+  uint8_t _dataOut {0xFF};
+  uint8_t _buttonMask {0xFF};
+  
 
   TwoWire*  _wire;
 };