diff --git a/dom/media/Intervals.h b/dom/media/Intervals.h
index 4e0cbf161ff7..f2c74aaa0433 100644
--- a/dom/media/Intervals.h
+++ b/dom/media/Intervals.h
@@ -574,10 +574,6 @@ public:
 
   bool Contains(const ElemType& aInterval) const {
     for (const auto& interval : mIntervals) {
-      if (aInterval.LeftOf(interval)) {
-        // Will never succeed.
-        return false;
-      }
       if (interval.Contains(aInterval)) {
         return true;
       }