diff --git a/interface/src/avatar/FaceModel.cpp b/interface/src/avatar/FaceModel.cpp
index b0ef947f65..e81e1da117 100644
--- a/interface/src/avatar/FaceModel.cpp
+++ b/interface/src/avatar/FaceModel.cpp
@@ -18,7 +18,7 @@ FaceModel::FaceModel(Head* owningHead) :
 {
 }
 
-void FaceModel::simulate(float deltaTime) {
+void FaceModel::simulate(float deltaTime, bool fullUpdate) {
     updateGeometry();
     Avatar* owningAvatar = static_cast<Avatar*>(_owningHead->_owningAvatar);
     glm::vec3 neckPosition;
diff --git a/interface/src/avatar/FaceModel.h b/interface/src/avatar/FaceModel.h
index acf2d2baf4..d675495e6b 100644
--- a/interface/src/avatar/FaceModel.h
+++ b/interface/src/avatar/FaceModel.h
@@ -21,7 +21,7 @@ public:
 
     FaceModel(Head* owningHead);
 
-    void simulate(float deltaTime);
+    virtual void simulate(float deltaTime, bool fullUpdate = true);
     
 protected: