diff --git a/NullDisplay.cpp b/NullDisplay.cpp
index 9eb3059..e412018 100644
--- a/NullDisplay.cpp
+++ b/NullDisplay.cpp
@@ -68,6 +68,10 @@ void CNullDisplay::clearFusionInt()
 {
 }
 
+void CNullDisplay::writeCWInt()
+{
+}
+
 void CNullDisplay::close()
 {
 }
diff --git a/NullDisplay.h b/NullDisplay.h
index 7040157..6d818ef 100644
--- a/NullDisplay.h
+++ b/NullDisplay.h
@@ -47,6 +47,8 @@ protected:
 	virtual void writeFusionInt(const char* source, const char* dest, const char* type, const char* origin);
 	virtual void clearFusionInt();
 
+	virtual void writeCWInt();
+
 private:
 };
 
diff --git a/TFTSerial.cpp b/TFTSerial.cpp
index 8a0dc9d..e1199a4 100644
--- a/TFTSerial.cpp
+++ b/TFTSerial.cpp
@@ -311,6 +311,10 @@ void CTFTSerial::clearFusionInt()
 	displayText("              ");
 }
 
+void CTFTSerial::writeCWInt()
+{
+}
+
 void CTFTSerial::close()
 {
 	m_serial.close();
diff --git a/TFTSerial.h b/TFTSerial.h
index 00e60fc..b86d2d5 100644
--- a/TFTSerial.h
+++ b/TFTSerial.h
@@ -49,6 +49,8 @@ protected:
 	virtual void writeFusionInt(const char* source, const char* dest, const char* type, const char* origin);
 	virtual void clearFusionInt();
 
+	virtual void writeCWInt();
+
 private:
    std::string       m_callsign;
    unsigned int      m_dmrid;