diff --git a/src/MCP23017.cpp b/src/MCP23017.cpp
index b7d6b53..eda5958 100644
--- a/src/MCP23017.cpp
+++ b/src/MCP23017.cpp
@@ -10,6 +10,10 @@ MCP23017::MCP23017(TwoWire& bus) {
 	_bus = &bus;
 }
 
+
+MCP23017::MCP23017() {}
+
+
 MCP23017::~MCP23017() {}
 
 void MCP23017::init()
diff --git a/src/MCP23017.h b/src/MCP23017.h
index b66df22..4e08ff9 100644
--- a/src/MCP23017.h
+++ b/src/MCP23017.h
@@ -93,6 +93,7 @@ class MCP23017
 	 * MCP23017_I2C_ADDRESS default.
 	 */
 	MCP23017(TwoWire& bus = Wire);
+	MCP23017();
 	~MCP23017();
 #ifdef _DEBUG
 	void debug();