diff --git a/build.sh b/build.sh
index 4826819..a0623ef 100755
--- a/build.sh
+++ b/build.sh
@@ -60,7 +60,7 @@ cat > $cdir/stop.sh <<EOF
 for p in 9180 8181
 do
 	PID=\$(lsof -t -i:\$p)
-	kill -9 \$p
+	kill -9 \$PID
 done
 EOF
 chmod +x $cdir/start.sh stop.sh