diff --git a/v4l2/t.c b/v4l2/t.c
index ff01a33..cabc1eb 100644
--- a/v4l2/t.c
+++ b/v4l2/t.c
@@ -8,7 +8,7 @@
 #include  <math.h>
 #include  <string.h>
 #include  <sys/ioctl.h>
-
+#include  <inttypes.h>
 #include  <linux/videodev2.h>
 
 #include  "funcs.h"