diff --git a/clock-chime.lua b/clock-chime.lua
index 963dd18..3244ca1 100644
--- a/clock-chime.lua
+++ b/clock-chime.lua
@@ -10,12 +10,14 @@ function pulse ()
 end
 
 while true do
-    local timedelta = os.time("ingame") % 12
-    if timedelta < 0.2 then -- too strict?
+    local timedelta = (os.time("ingame") % 12) * 60 -- all times in seconds
+    local sleep_amt = ((12 * 60) - timedelta) / 2 -- cut the time in half?
+    if timedelta < 1 then
         pulse()
-        os.sleep(0.2) -- don't pulse more than once
-    else
-        local sleep_amt = 60 * (12 - timedelta) / 2 -- cut the time in half?
+        os.sleep(1) -- don't pulse more than once
+    elseif sleep_amt > 1 then
         os.sleep(sleep_amt)
+    else
+        os.sleep(0.2)
     end
 end