diff --git a/canutils/candump/candump.c b/canutils/candump/candump.c
index 5bea919f6..b040c1542 100644
--- a/canutils/candump/candump.c
+++ b/canutils/candump/candump.c
@@ -115,7 +115,7 @@ extern int optind, opterr, optopt;
 
 static volatile int running = 1;
 
-void print_usage(char *prg)
+static void print_usage(char *prg)
 {
 	fprintf(stderr, "%s - dump CAN bus traffic.\n", prg);
 	fprintf(stderr, "\nUsage: %s [options] <CAN interface>+\n", prg);
diff --git a/canutils/cansend/cansend.c b/canutils/cansend/cansend.c
index a629a4a64..1001b52c8 100644
--- a/canutils/cansend/cansend.c
+++ b/canutils/cansend/cansend.c
@@ -56,7 +56,7 @@
 
 #include "lib.h"
 
-void print_usage_send(char *prg)
+static void print_usage_send(char *prg)
 {
 	fprintf(stderr, "%s - send CAN-frames via CAN_RAW sockets.\n", prg);
 	fprintf(stderr, "\nUsage: %s <device> <can_frame>.\n", prg);