diff --git a/tc/tc_util.h b/tc/tc_util.h
index 208adbe1..b3d70da9 100644
--- a/tc/tc_util.h
+++ b/tc/tc_util.h
@@ -35,11 +35,11 @@ extern int get_percent(unsigned *percent, const char *str);
 extern int get_size(unsigned *size, const char *str);
 extern int get_size_and_cell(unsigned *size, int *cell_log, char *str);
 extern int get_usecs(unsigned *usecs, const char *str);
-extern int print_rate(char *buf, int len, __u32 rate);
-extern int print_size(char *buf, int len, __u32 size);
-extern int print_percent(char *buf, int len, __u32 percent);
-extern int print_qdisc_handle(char *buf, int len, __u32 h);
-extern int print_usecs(char *buf, int len, __u32 usecs);
+extern void print_rate(char *buf, int len, __u32 rate);
+extern void print_size(char *buf, int len, __u32 size);
+extern void print_percent(char *buf, int len, __u32 percent);
+extern void print_qdisc_handle(char *buf, int len, __u32 h);
+extern void print_usecs(char *buf, int len, __u32 usecs);
 extern char * sprint_rate(__u32 rate, char *buf);
 extern char * sprint_size(__u32 size, char *buf);
 extern char * sprint_qdisc_handle(__u32 h, char *buf);