diff --git a/init.lua b/init.lua
index d8a293a..074d883 100644
--- a/init.lua
+++ b/init.lua
@@ -352,5 +352,16 @@ function vicious.call_async(wtype, format, warg, callback)
 end
 -- }}}
 
+-- {{{ Change the timer of a registered widget.
+function vicious.change_timer(reg, timer_)
+  if not reg then return end
+  if timer_ ~= reg.timer then
+    vicious.unregister(nil, true, reg)
+    reg.timer = timer_
+    regregister(reg)
+  end
+end
+-- }}}
+
 return vicious
 -- }}}