--- a/dom/base/Navigator.cpp
+++ b/dom/base/Navigator.cpp
@@ -804,17 +804,17 @@ Navigator::Vibrate(const nsTArray<uint32
   for (size_t i = 0; i < pattern.Length(); ++i) {
     if (pattern[i] > sMaxVibrateMS) {
       pattern[i] = sMaxVibrateMS;
     }
   }
 
   // The spec says we check sVibratorEnabled after we've done the sanity
   // checking on the pattern.
-  if (pattern.IsEmpty() || !sVibratorEnabled) {
+  if (!sVibratorEnabled) {
     return true;
   }
 
   // Add a listener to cancel the vibration if the document becomes hidden,
   // and remove the old visibility listener, if there was one.
 
   if (!gVibrateWindowListener) {
     // If gVibrateWindowListener is null, this is the first time we've vibrated,