diff --git a/include/boost/json/basic_parser_impl.hpp b/include/boost/json/basic_parser_impl.hpp
index 7ab6f1355..e95af215a 100644
--- a/include/boost/json/basic_parser_impl.hpp
+++ b/include/boost/json/basic_parser_impl.hpp
@@ -217,8 +217,8 @@ const char*
 basic_parser<Handler>::
 sentinel()
 {
-    return reinterpret_cast<
-        const char*>(this);
+    static const char sentinel{};
+    return &sentinel;
 }
 
 template<class Handler>