diff --git a/usr.bin/make/job.c b/usr.bin/make/job.c
index 3d9240a7162..ba8787b18dc 100644
--- a/usr.bin/make/job.c
+++ b/usr.bin/make/job.c
@@ -485,7 +485,7 @@ catch_child(int sig __unused)
 /**
  */
 void
-Proc_Init()
+Proc_Init(void)
 {
 	/*
 	 * Catch SIGCHLD so that we get kicked out of select() when we