diff --git a/lib/common/mem.h b/lib/common/mem.h
index 201d9bb0f..99de9cb36 100644
--- a/lib/common/mem.h
+++ b/lib/common/mem.h
@@ -49,6 +49,9 @@ extern "C" {
 /*-****************************************
 *  Compiler specifics
 ******************************************/
+#if defined(_MSC_VER)
+#   include <intrin.h>   /* _byteswap_ */
+#endif
 #if defined(__GNUC__)
 #  define MEM_STATIC static __attribute__((unused))
 #elif defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)