diff --git a/include/flatbuffers/flexbuffers.h b/include/flatbuffers/flexbuffers.h
index 7bf8430..79cdd9c 100644
--- a/include/flatbuffers/flexbuffers.h
+++ b/include/flatbuffers/flexbuffers.h
@@ -17,6 +17,7 @@
 #ifndef FLATBUFFERS_FLEXBUFFERS_H_
 #define FLATBUFFERS_FLEXBUFFERS_H_
 
+#include <algorithm>
 #include <map>
 // Used to select STL variant.
 #include "flatbuffers/base.h"