diff --git a/libraries/liblmdb/chacha8.c b/libraries/liblmdb/chacha8.c
index 87201d0..b4b8f97 100644
--- a/libraries/liblmdb/chacha8.c
+++ b/libraries/liblmdb/chacha8.c
@@ -6,7 +6,9 @@ Public domain.
 
 #include <memory.h>
 #include <stdio.h>
+#ifndef _MSC_VER
 #include <sys/param.h>
+#endif // !_MSC_VER
 
 #include "chacha8.h"
 #if 0