diff --git a/src/internal/sio_packet.cpp b/src/internal/sio_packet.cpp
index 6f6317af..da73edb4 100644
--- a/src/internal/sio_packet.cpp
+++ b/src/internal/sio_packet.cpp
@@ -9,6 +9,7 @@
 #include <rapidjson/encodedstream.h>
 #include <rapidjson/writer.h>
 #include <cassert>
+#include <algorithm>
 
 #define kBIN_PLACE_HOLDER "_placeholder"