Stricter cleanup
diff --git a/utils/ci/check_manual_usage_example.sh b/utils/ci/check_manual_usage_example.sh
index 2d43e36..9d8b55d 100755
--- a/utils/ci/check_manual_usage_example.sh
+++ b/utils/ci/check_manual_usage_example.sh
@@ -51,7 +51,8 @@
     timeout --version
 fi
 # Initial cleanup
-pkill -f 'SCREEN -L -S sonemu' || true
+pkill --signal KILL -f 'SCREEN -L -S sonemu' || true
+sleep 1s
 screen -wipe || true
 rm -f screenlog.0