diff --git a/content/media/webaudio/AudioBuffer.cpp b/content/media/webaudio/AudioBuffer.cpp
index 35cc4b400925..b2dee4b61369 100644
--- a/content/media/webaudio/AudioBuffer.cpp
+++ b/content/media/webaudio/AudioBuffer.cpp
@@ -62,6 +62,8 @@ AudioBuffer::~AudioBuffer()
 bool
 AudioBuffer::InitializeBuffers(uint32_t aNumberOfChannels, JSContext* aJSContext)
 {
+  NS_HOLD_JS_OBJECTS(this, AudioBuffer);
+
   if (!mChannels.SetCapacity(aNumberOfChannels)) {
     return false;
   }
@@ -73,8 +75,6 @@ AudioBuffer::InitializeBuffers(uint32_t aNumberOfChannels, JSContext* aJSContext
     mChannels.AppendElement(array);
   }
 
-  NS_HOLD_JS_OBJECTS(this, AudioBuffer);
-
   return true;
 }