diff --git a/example/cuse_client.c b/example/cuse_client.c
index 465302c..903ffc6 100644
--- a/example/cuse_client.c
+++ b/example/cuse_client.c
@@ -45,6 +45,7 @@
 #include <stdlib.h>
 #include <ctype.h>
 #include <errno.h>
+#include <unistd.h>
 #include "ioctl.h"
 
 const char *usage =
diff --git a/example/ioctl_client.c b/example/ioctl_client.c
index dcb18cc..019d030 100644
--- a/example/ioctl_client.c
+++ b/example/ioctl_client.c
@@ -29,6 +29,7 @@
 #include <stdlib.h>
 #include <ctype.h>
 #include <errno.h>
+#include <unistd.h>
 #include "ioctl.h"
 
 const char *usage =