1 files changed, 1 insertions, 0 deletions
diff --git a/doc/html/boost_asio/example/cpp11/executors/fork_join.cpp b/doc/html/boost_asio/example/cpp11/executors/fork_join.cpp
index 4cfd5e6fca..98926d53fe 100644
--- a/doc/html/boost_asio/example/cpp11/executors/fork_join.cpp
+++ b/doc/html/boost_asio/example/cpp11/executors/fork_join.cpp
@@ -6,6 +6,7 @@
 #include <mutex>
 #include <queue>
 #include <thread>
+#include <numeric>
 
 using boost::asio::dispatch;
 using boost::asio::execution_context;