diff --git a/prometheus.py b/prometheus.py
index 440971e..9e45d69 100755
--- a/prometheus.py
+++ b/prometheus.py
@@ -49,7 +49,7 @@ class Prometheus():
     
     def handler(self, metrics_handler):
         now = time()
-        if now >= i(self._last_update + self.ttl):
+        if now >= (self._last_update + self.ttl):
             self._metrics.update()
             self._last_update = now