diff --git a/src/vty/cpu_sched_vty.c b/src/vty/cpu_sched_vty.c
index dbb3cd5..301e7a6 100644
--- a/src/vty/cpu_sched_vty.c
+++ b/src/vty/cpu_sched_vty.c
@@ -89,7 +89,7 @@
 };
 
 /* returns number of configured CPUs in the system, or negative otherwise */
-static int get_num_cpus() {
+static int get_num_cpus(void) {
 	static unsigned int num_cpus = 0;
 	long ln;