diff --git a/example/enum_flag_example.cpp b/example/enum_flag_example.cpp
index 1cedd93..d2eaf79 100644
--- a/example/enum_flag_example.cpp
+++ b/example/enum_flag_example.cpp
@@ -21,6 +21,7 @@
 // SOFTWARE.
 
 #include <iostream>
+#include <string>
 
 #include <magic_enum.hpp>