diff --git a/pyfan.py b/pyfan.py
index 399ea7d..011051d 100644
--- a/pyfan.py
+++ b/pyfan.py
@@ -121,7 +121,7 @@ class PyFan:
         self.hwmon_map = {}
         self.gen_hwmon_map()
 
-        if self.config["interval"]:
+        if "interval" in self.config:
             self.interval = self.config["interval"]
         else:
             self.interval = 1