diff --git a/astlpc.c b/astlpc.c
index 079d9c5..d1cf509 100644
--- a/astlpc.c
+++ b/astlpc.c
@@ -5,7 +5,6 @@
 #include <stdbool.h>
 #include <stdlib.h>
 #include <string.h>
-#include <unistd.h>
 
 #define pr_fmt(x) "astlpc: " x
 
@@ -16,6 +15,7 @@
 
 #ifdef MCTP_HAVE_FILEIO
 
+#include <unistd.h>
 #include <fcntl.h>
 #include <sys/ioctl.h>
 #include <sys/mman.h>
diff --git a/serial.c b/serial.c
index 781a9c1..3186a2d 100644
--- a/serial.c
+++ b/serial.c
@@ -4,13 +4,13 @@
 #include <stdbool.h>
 #include <stdlib.h>
 #include <string.h>
-#include <unistd.h>
 
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 
 #ifdef MCTP_HAVE_FILEIO
+#include <unistd.h>
 #include <fcntl.h>
 #else
 static const size_t write(int fd, void *buf, size_t len)