diff --git a/lib/libmd/mdXhl.c b/lib/libmd/mdXhl.c
index 62be2359c1d4..f2e918f548d9 100644
--- a/lib/libmd/mdXhl.c
+++ b/lib/libmd/mdXhl.c
@@ -49,7 +49,7 @@ MDXFile(const char *filename, char *buf)
 char *
 MDXFileChunk(const char *filename, char *buf, off_t ofs, off_t len)
 {
-	unsigned char buffer[BUFSIZ];
+	unsigned char buffer[16*1024];
 	MDX_CTX ctx;
 	struct stat stbuf;
 	int f, i, e;