diff --git a/panels/temperature.py b/panels/temperature.py
index aef87e33..9a466a74 100644
--- a/panels/temperature.py
+++ b/panels/temperature.py
@@ -92,11 +92,13 @@ class TemperaturePanel(ScreenPanel):
 
     def preheat(self):
         self.labels["preheat_grid"] = self._gtk.HomogeneousGrid()
-        for i, option in enumerate(self.preheat_options):
+        i = 0
+        for option in self.preheat_options:
             if option != "cooldown":
                 self.labels[option] = self._gtk.Button(option, f"color{(i % 4) + 1}")
                 self.labels[option].connect("clicked", self.set_temperature, option)
                 self.labels['preheat_grid'].attach(self.labels[option], (i % 2), int(i / 2), 1, 1)
+                i += 1
         scroll = Gtk.ScrolledWindow()
         scroll.set_policy(Gtk.PolicyType.NEVER, Gtk.PolicyType.AUTOMATIC)
         scroll.add(self.labels["preheat_grid"])