diff --git a/monitors/ufw.py b/monitors/ufw.py
index 381db6c..3184d9e 100644
--- a/monitors/ufw.py
+++ b/monitors/ufw.py
@@ -11,6 +11,6 @@ class UFW:
         stream = os.popen('ufw status | grep "Status: active" | wc -l')
         output = stream.read()
         self.exporter.gauge("ufw.status", int(output))
-        stream = os.popen('ufw status | grep -E '^[0-9]' | wc -l')
+        stream = os.popen("ufw status | grep -E '^[0-9]' | wc -l")
         output = stream.read()
         self.exporter.gauge("ufw.rules", int(output))