diff --git a/include/flatbuffers/flatbuffers.h b/include/flatbuffers/flatbuffers.h
index 60a239612..6f120f6b7 100644
--- a/include/flatbuffers/flatbuffers.h
+++ b/include/flatbuffers/flatbuffers.h
@@ -21,6 +21,7 @@
 
 #include <cstdint>
 #include <cstddef>
+#include <cstdlib>
 #include <cstring>
 #include <string>
 #include <type_traits>