diff --git a/ArduCopter/Log.pde b/ArduCopter/Log.pde
index 1e19b9b3a9..fadc2d6fed 100644
--- a/ArduCopter/Log.pde
+++ b/ArduCopter/Log.pde
@@ -1028,6 +1028,8 @@ static void Log_Write_GPS() {}
 static void Log_Write_Current() {}
 static void Log_Write_Attitude() {}
 static void Log_Write_Data() {}
+static void Log_Write_Data(int8_t _type, float _data){}
+static void Log_Write_Data(int8_t _type, int32_t _data){}
 #ifdef OPTFLOW_ENABLED
 static void Log_Write_Optflow() {}
 #endif