diff --git a/test/shell_test.exp b/test/shell_test.exp
index c60f516fd..b713ed09b 100644
--- a/test/shell_test.exp
+++ b/test/shell_test.exp
@@ -424,6 +424,7 @@ njs_run {"-c" "console.log(process.pid)"} "\\d+"
 njs_run {"-c" "console.log(process.ppid)"} "\\d+"
 
 njs_run {"-c" "console.log(process.kill(process.pid, 0))"} "true"
+njs_run {"-c" "console.log(process.kill(process.pid, 'SIGCHLD'))"} "true"
 
 
 # script args