diff --git a/main.c b/main.c
index 3a28a20..d605221 100644
--- a/main.c
+++ b/main.c
@@ -13,6 +13,7 @@
 #include <errno.h>
 #include <string.h>
 #include <stdarg.h>
+#include <unistd.h>
 
 #include "config.h"
 #include "amalloc.h"
diff --git a/makepage.c b/makepage.c
index 56dfa8c..bbc495d 100644
--- a/makepage.c
+++ b/makepage.c
@@ -6,6 +6,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <mkdio.h>
+#include <unistd.h>
 #include "config.h"
 #include "pgm_options.h"