diff --git a/lib/libnfs-zdr.c b/lib/libnfs-zdr.c
index 8ec3755..5cf85c6 100644
--- a/lib/libnfs-zdr.c
+++ b/lib/libnfs-zdr.c
@@ -36,11 +36,14 @@
 #include <arpa/inet.h>
 #endif
 
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
 #include <stddef.h>
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
-#include <unistd.h>
 #include "libnfs-zdr.h"
 #include "libnfs.h"
 #include "libnfs-raw.h"