diff --git a/main.lua b/main.lua
index c257e3b..c36327c 100644
--- a/main.lua
+++ b/main.lua
@@ -5,6 +5,8 @@ local Clock = require"clock"
 
 local clock
 
+local inputSource
+
 function love.mousemoved(x, y, dx, dy, istouch)
   clock:movemouse(x, y)
 end
@@ -55,10 +57,10 @@ function love.load()
   minuteBox.OnValueChanged = setClock
 
   function updateInputNoCallback(input, value)
-    callback = input.onValueChanged
-    input.onValueChanged = nil
+    local callback = input.OnValueChanged
+    input.OnValueChanged = nil
     input:SetValue(value)
-    input.onValueChanged = callback
+    input.OnValueChanged = callback
   end
 
   function updateInputs(time)