diff --git a/idaes/core/base/flowsheet_model.py b/idaes/core/base/flowsheet_model.py
index 7b9fbf0aa9..dff8958f32 100644
--- a/idaes/core/base/flowsheet_model.py
+++ b/idaes/core/base/flowsheet_model.py
@@ -75,6 +75,7 @@ def __init__(self):
             self.installed = False
         else:
             import idaes_ui
+
             self.visualize = idaes_ui.fv.visualize
             self.installed = True