diff --git a/usr.bin/bc/bc.y b/usr.bin/bc/bc.y
index f7425f24628d..a802f5a3ef2a 100644
--- a/usr.bin/bc/bc.y
+++ b/usr.bin/bc/bc.y
@@ -1084,7 +1084,7 @@ escape(const char *str)
 }
 
 /* ARGSUSED */
-void
+static void
 sigchld(int signo)
 {
 	pid_t pid;