diff --git a/content/media/webaudio/AudioContext.cpp b/content/media/webaudio/AudioContext.cpp
index a8df6e50409..95e6b61fa50 100644
--- a/content/media/webaudio/AudioContext.cpp
+++ b/content/media/webaudio/AudioContext.cpp
@@ -106,7 +106,7 @@ AudioContext::CreateGain()
 already_AddRefed<DelayNode>
 AudioContext::CreateDelay(float aMaxDelayTime, ErrorResult& aRv)
 {
-  if (aMaxDelayTime <= 0.f) {
+  if (aMaxDelayTime <= 0.f || aMaxDelayTime >= 3.f) {
     aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
     return nullptr;
   }
diff --git a/content/media/webaudio/test/test_delayNode.html b/content/media/webaudio/test/test_delayNode.html
index 135df473d2a..7e4d872b963 100644
--- a/content/media/webaudio/test/test_delayNode.html
+++ b/content/media/webaudio/test/test_delayNode.html
@@ -56,6 +56,9 @@ addLoadEvent(function() {
   expectException(function() {
     context.createDelay(0);
   }, DOMException.NOT_SUPPORTED_ERR);
+  expectException(function() {
+    context.createDelay(3);
+  }, DOMException.NOT_SUPPORTED_ERR);
   expectException(function() {
     context.createDelay(-1);
   }, DOMException.NOT_SUPPORTED_ERR);