diff --git a/include/crow/http_connection.h b/include/crow/http_connection.h
index 45143a5ae..a483798f3 100644
--- a/include/crow/http_connection.h
+++ b/include/crow/http_connection.h
@@ -3,6 +3,7 @@
 #define ASIO_STANDALONE
 #endif
 #include <asio.hpp>
+#include <algorithm>
 #include <atomic>
 #include <chrono>
 #include <vector>