diff --git a/Sources/OpenImageIO/include/OpenImageIO/bit.h b/Sources/OpenImageIO/include/OpenImageIO/bit.h
index e2a25213..848f2780 100644
--- a/Sources/OpenImageIO/include/OpenImageIO/bit.h
+++ b/Sources/OpenImageIO/include/OpenImageIO/bit.h
@@ -9,6 +9,7 @@
 #include <OpenImageIO/oiioversion.h>
 #include <OpenImageIO/platform.h>
 
+#include <cstring>
 #include <memory>