diff --git a/libraries/animation/src/AnimClip.cpp b/libraries/animation/src/AnimClip.cpp
index 80498c44e8..6aaf07a466 100644
--- a/libraries/animation/src/AnimClip.cpp
+++ b/libraries/animation/src/AnimClip.cpp
@@ -10,10 +10,13 @@
 
 #include "AnimClip.h"
 
+#include <assert.h>
+
 #include "GLMHelpers.h"
 #include "AnimationLogging.h"
 #include "AnimUtil.h"
 
+
 AnimClip::AnimClip(const QString& id, const QString& url, float startFrame, float endFrame, float timeScale, bool loopFlag, bool mirrorFlag) :
     AnimNode(AnimNode::Type::Clip, id),
     _startFrame(startFrame),