diff --git a/example/cxxopts.hpp b/example/cxxopts.hpp
index 80b695a9..5f81202a 100644
--- a/example/cxxopts.hpp
+++ b/example/cxxopts.hpp
@@ -25,6 +25,7 @@ THE SOFTWARE.
 #ifndef CXXOPTS_HPP_INCLUDED
 #define CXXOPTS_HPP_INCLUDED
 
+#include <algorithm>
 #include <cstring>
 #include <cctype>
 #include <exception>
diff --git a/example/passthrough_hp.cc b/example/passthrough_hp.cc
index 2dc0f950..fad8ac3b 100644
--- a/example/passthrough_hp.cc
+++ b/example/passthrough_hp.cc
@@ -76,6 +76,7 @@
 #include <cstdio>
 #include <cstdlib>
 #include "cxxopts.hpp"
+#include <functional>
 #include <mutex>
 #include <syslog.h>
 #include <atomic>