diff --git a/v4l2/v4l2_pr_structs.h b/v4l2/v4l2_pr_structs.h
index 27aa743f..f1616eb5 100644
--- a/v4l2/v4l2_pr_structs.h
+++ b/v4l2/v4l2_pr_structs.h
@@ -12,6 +12,7 @@ int pr_v4l2_requestbuffers(char *txt, struct v4l2_requestbuffers *ptr);
 
 char *str_input_type(int t);
 char *str_ctrl_type(int type);
+void pr_ctrl_id(uint32_t id);
 
 /* --------------------------------------------------------------------- */
 
diff --git a/v4l2/video-infos.c b/v4l2/video-infos.c
index fbc080f4..7533d814 100644
--- a/v4l2/video-infos.c
+++ b/v4l2/video-infos.c
@@ -9,6 +9,7 @@
 #include  <string.h>
 #include  <sys/ioctl.h>
 #include  <errno.h>
+#include  <inttypes.h>
 #include  <linux/videodev2.h>
 
 #include  "../floatimg.h"