diff --git a/example/from_json.cpp b/example/from_json.cpp
index 74d651f..2c425d3 100644
--- a/example/from_json.cpp
+++ b/example/from_json.cpp
@@ -5,11 +5,14 @@
 #include <boost/describe.hpp>
 #include <boost/mp11.hpp>
 #include <boost/json.hpp>
+#include <boost/version.hpp>
 #include <type_traits>
 
 namespace app
 {
 
+#if BOOST_VERSION < 108100
+
 template<class T> void extract( boost::json::object const & obj, char const * name, T & value )
 {
     value = boost::json::value_to<T>( obj.at( name ) );
@@ -36,6 +39,8 @@ template<class T,
     return t;
 }
 
+#endif
+
 struct A
 {
     int x;
diff --git a/example/to_json.cpp b/example/to_json.cpp
index e9a073a..3b7fa29 100644
--- a/example/to_json.cpp
+++ b/example/to_json.cpp
@@ -5,6 +5,7 @@
 #include <boost/describe.hpp>
 #include <boost/mp11.hpp>
 #include <boost/json.hpp>
+#include <boost/version.hpp>
 #include <type_traits>
 #include <vector>
 #include <map>
@@ -12,6 +13,8 @@
 namespace app
 {
 
+#if BOOST_VERSION < 108100
+
 template<class T,
     class D1 = boost::describe::describe_members<T,
         boost::describe::mod_public | boost::describe::mod_protected>,
@@ -29,6 +32,8 @@ template<class T,
     });
 }
 
+#endif
+
 struct A
 {
     int x;