--- a/dom/media/webaudio/AudioBlock.cpp
+++ b/dom/media/webaudio/AudioBlock.cpp
@@ -38,17 +38,17 @@ public:
     size *= aChannelCount;
     size *= sizeof(float);
     size += sizeof(AudioBlockBuffer);
     size += 15;  //padding for alignment
     if (!size.isValid()) {
       MOZ_CRASH();
     }
 
-    void* m = moz_xmalloc(size.value());
+    void* m = operator new(size.value());
     RefPtr<AudioBlockBuffer> p = new (m) AudioBlockBuffer();
     NS_ASSERTION((reinterpret_cast<char*>(p.get() + 1) - reinterpret_cast<char*>(p.get())) % 4 == 0,
                  "AudioBlockBuffers should be at least 4-byte aligned");
     return p.forget();
   }
 
   // Graph thread only.
   void DownstreamRefAdded() { ++mDownstreamRefCount; }