diff --git a/src/stream.h b/src/stream.h
index 31c2680..1b6c0e8 100644
--- a/src/stream.h
+++ b/src/stream.h
@@ -17,6 +17,7 @@
 #include <variant>
 #include <vector>
 #include <utility>
+#include <cstdlib>
 
 #ifndef __cpp_lib_bit_cast
 #include <cstring>