diff --git a/example/cxxopts.hpp b/example/cxxopts.hpp
index 6fd170d..6906e3b 100644
--- a/example/cxxopts.hpp
+++ b/example/cxxopts.hpp
@@ -37,6 +37,7 @@ THE SOFTWARE.
 #include <unordered_map>
 #include <unordered_set>
 #include <vector>
+#include <limits>
 
 #ifdef __cpp_lib_optional
 #include <optional>