diff --git a/tools/mkclass/classcompiler.hpp b/tools/mkclass/classcompiler.hpp
index 138ea40ea..3b9844853 100644
--- a/tools/mkclass/classcompiler.hpp
+++ b/tools/mkclass/classcompiler.hpp
@@ -78,6 +78,10 @@ struct Field
 	bool PureSetAccessor;
 	std::string DefaultAccessor;
 
+	Field(void)
+		: Attributes(0), PureGetAccessor(false), PureSetAccessor(false)
+	{ }
+
 	std::string GetFriendlyName(void) const
 	{
 		if (!AlternativeName.empty())