diff --git a/s4-funcs.sh b/s4-funcs.sh
index a9b616e..74705a0 100755
--- a/s4-funcs.sh
+++ b/s4-funcs.sh
@@ -352,7 +352,7 @@
   rm $sqi
 }
 cleanup2() {	# Dirty workaround for produced zombie processes
-  if [ -z "$TTY" ]; then	# When called in daemon environment
+  if [ -n "$HTTP_USER_AGENT" ]; then	# When called from httpd
     pkill -9 -u `id -u` -P 1
   fi
 }