diff --git a/keras/utils/vis_utils.py b/keras/utils/vis_utils.py
index 334d79c5f939f5175416224d646543086d1d4dc7..c15586845c21599718c10a79f19c0355d3f8dcdc 100644
--- a/keras/utils/vis_utils.py
+++ b/keras/utils/vis_utils.py
@@ -61,7 +61,6 @@ def model_to_dot(model,
     if isinstance(model, Sequential):
         if not model.built:
             model.build()
-        model = model.model
     layers = model.layers
 
     # Create graph nodes.