diff --git a/json.hpp b/json.hpp
index c4e30bbe..bbf2e774 100644
--- a/json.hpp
+++ b/json.hpp
@@ -190,6 +190,7 @@ namespace json {
             virtual bool operator==(const node   &rhs) const
                 { return rhs == *this; }
 
+            operator bool (void) const { return m_value; }
             bool native (void) const { return m_value; }
 
             virtual std::ostream& print (std::ostream &os) const;