--- a/dom/media/webaudio/AudioNodeEngine.cpp
+++ b/dom/media/webaudio/AudioNodeEngine.cpp
@@ -5,16 +5,17 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "AudioNodeEngine.h"
 #ifdef BUILD_ARM_NEON
 #include "mozilla/arm.h"
 #include "AudioNodeEngineNEON.h"
 #endif
 #ifdef USE_SSE2
+#include "mozilla/SSE.h"
 #include "AlignmentUtils.h"
 #include "AudioNodeEngineSSE2.h"
 #endif
 
 namespace mozilla {
 
 already_AddRefed<ThreadSharedFloatArrayBufferList>
 ThreadSharedFloatArrayBufferList::Create(uint32_t aChannelCount,