diff --git a/spec/core/DelayedFunctionSchedulerSpec.js b/spec/core/DelayedFunctionSchedulerSpec.js
index 0615f493..8370ace2 100644
--- a/spec/core/DelayedFunctionSchedulerSpec.js
+++ b/spec/core/DelayedFunctionSchedulerSpec.js
@@ -12,6 +12,19 @@ describe("DelayedFunctionScheduler", function() {
     expect(fn).toHaveBeenCalled();
   });
 
+  it("defaults delay to 0", function() {
+    var scheduler = new jasmine.DelayedFunctionScheduler(),
+      fn = jasmine.createSpy('fn');
+
+    scheduler.scheduleFunction(fn);
+
+    expect(fn).not.toHaveBeenCalled();
+
+    scheduler.tick(0);
+
+    expect(fn).toHaveBeenCalled();
+  });
+
   it("optionally passes params to scheduled functions", function() {
     var scheduler = new jasmine.DelayedFunctionScheduler(),
       fn = jasmine.createSpy('fn');
diff --git a/src/core/DelayedFunctionScheduler.js b/src/core/DelayedFunctionScheduler.js
index 15cb3f37..0f9cb399 100644
--- a/src/core/DelayedFunctionScheduler.js
+++ b/src/core/DelayedFunctionScheduler.js
@@ -5,11 +5,13 @@ jasmine.DelayedFunctionScheduler = function() {
   var delayedFnCount = 0;
 
   self.tick = function(millis) {
+    millis = millis || 0;
     runFunctionsWithinRange(currentTime, currentTime + millis);
     currentTime = currentTime + millis;
   };
 
   self.scheduleFunction = function(funcToCall, millis, params, recurring, timeoutKey, runAtMillis) {
+    millis = millis || 0;
     timeoutKey = timeoutKey || ++delayedFnCount;
     runAtMillis = runAtMillis || (currentTime + millis);
     scheduledFunctions[timeoutKey] = {