diff --git a/src/pugixml.cpp b/src/pugixml.cpp
index 87cd0dc..15a77c1 100644
--- a/src/pugixml.cpp
+++ b/src/pugixml.cpp
@@ -4703,7 +4703,7 @@ PUGI__NS_BEGIN
 	template <typename String, typename Header>
 	PUGI__FN bool set_value_bool(String& dest, Header& header, uintptr_t header_mask, bool value)
 	{
-		return strcpy_insitu(dest, header, header_mask, value ? PUGIXML_TEXT("true") : PUGIXML_TEXT("false"), value ? 4 : 5);
+		return strcpy_insitu(dest, header, header_mask, value ? PUGIXML_TEXT("true") : PUGIXML_TEXT("false"), value ? 4 : 5, true);
 	}
 
 	PUGI__FN xml_parse_result load_buffer_impl(xml_document_struct* doc, xml_node_struct* root, void* contents, size_t size, unsigned int options, xml_encoding encoding, bool is_mutable, bool own, char_t** out_buffer)
diff --git a/src/pugixml.hpp b/src/pugixml.hpp
index 53edae8..8c855f6 100644
--- a/src/pugixml.hpp
+++ b/src/pugixml.hpp
@@ -247,8 +247,8 @@ namespace pugi {
 		bool value;
 		operator bool() const { return value; }
 	};
-	static const boolean true_value(true);
-	static const boolean false_value(false);
+	static const boolean (true_value)(true);
+	static const boolean (false_value)(false);
 } // namespace pugi
 
 namespace pugi