diff --git a/libraries/entities-renderer/src/RenderableModelEntityItem.cpp b/libraries/entities-renderer/src/RenderableModelEntityItem.cpp
index 4cd625c93f..73968607f7 100644
--- a/libraries/entities-renderer/src/RenderableModelEntityItem.cpp
+++ b/libraries/entities-renderer/src/RenderableModelEntityItem.cpp
@@ -394,17 +394,21 @@ void RenderableModelEntityItem::computeShapeInfo(ShapeInfo& info) {
         // collision model's extents).
 
         glm::vec3 scale = _dimensions / renderGeometry.getUnscaledMeshExtents().size();
-        // multiply each point by scale before handing the point-set off to the physics engine
+        // multiply each point by scale before handing the point-set off to the physics engine.
+        // also determine the extents of the collision model.
+        AABox box;
         for (int i = 0; i < _points.size(); i++) {
             for (int j = 0; j < _points[i].size(); j++) {
                 // compensate for registraion
                 _points[i][j] += _model->getOffset();
                 // scale so the collision points match the model points
                 _points[i][j] *= scale;
+                box += _points[i][j];
             }
         }
 
-        info.setParams(getShapeType(), _dimensions, _collisionModelURL);
+        glm::vec3 collisionModelDimensions = box.getDimensions();
+        info.setParams(getShapeType(), collisionModelDimensions, _collisionModelURL);
         info.setConvexHulls(_points);
     }
 }