diff --git a/Foundation/CPTimer.j b/Foundation/CPTimer.j
index 6edfa4818..19cca083b 100644
--- a/Foundation/CPTimer.j
+++ b/Foundation/CPTimer.j
@@ -254,6 +254,9 @@ var _CPTimerBridgeTimer = function(codeOrFunction, aDelay, shouldRepeat, functio
         theFunction = function() { codeOrFunction.apply(window, functionArgs); if (!shouldRepeat) CPTimersForTimeoutIDs[timeoutID] = nil; }
     }
 
+    // A call such as setTimeout(f) is technically invalid but browsers seem to treat it as setTimeout(f, 0), so so will we.
+    aDelay = aDelay | 0.0;
+
     CPTimersForTimeoutIDs[timeoutID] = [CPTimer scheduledTimerWithTimeInterval:aDelay / 1000 callback:theFunction repeats:shouldRepeat];
 
     return timeoutID;