diff --git a/IPython/html/widgets/widget_button.py b/IPython/html/widgets/widget_button.py
index bcb2d0eb6..793ae6f04 100644
--- a/IPython/html/widgets/widget_button.py
+++ b/IPython/html/widgets/widget_button.py
@@ -18,7 +18,7 @@ import inspect
 import types
 
 from .widget import DOMWidget
-from IPython.utils.traitlets import Unicode, Bool, Int
+from IPython.utils.traitlets import Unicode, Bool
 
 #-----------------------------------------------------------------------------
 # Classes
diff --git a/IPython/html/widgets/widget_float.py b/IPython/html/widgets/widget_float.py
index 4979e34a5..144269c7d 100644
--- a/IPython/html/widgets/widget_float.py
+++ b/IPython/html/widgets/widget_float.py
@@ -14,7 +14,7 @@ Represents an unbounded float using a widget.
 # Imports
 #-----------------------------------------------------------------------------
 from .widget import DOMWidget
-from IPython.utils.traitlets import Unicode, Float, Bool, List
+from IPython.utils.traitlets import Unicode, CFloat, Bool, List
 
 #-----------------------------------------------------------------------------
 # Classes
@@ -23,6 +23,6 @@ class FloatTextWidget(DOMWidget):
     view_name = Unicode('FloatTextView', sync=True)
 
     # Keys
-    value = Float(0.0, help="Float value", sync=True) 
+    value = CFloat(0.0, help="Float value", sync=True) 
     disabled = Bool(False, help="Enable or disable user changes", sync=True)
     description = Unicode(help="Description of the value this widget represents", sync=True)
diff --git a/IPython/html/widgets/widget_int.py b/IPython/html/widgets/widget_int.py
index 104d1fe77..2a3007157 100644
--- a/IPython/html/widgets/widget_int.py
+++ b/IPython/html/widgets/widget_int.py
@@ -14,7 +14,7 @@ Represents an unbounded int using a widget.
 # Imports
 #-----------------------------------------------------------------------------
 from .widget import DOMWidget
-from IPython.utils.traitlets import Unicode, Int, Bool, List
+from IPython.utils.traitlets import Unicode, CInt, Bool, List
 
 #-----------------------------------------------------------------------------
 # Classes
@@ -23,6 +23,6 @@ class IntTextWidget(DOMWidget):
     view_name = Unicode('IntTextView', sync=True)
 
     # Keys
-    value = Int(0, help="Int value", sync=True) 
+    value = CInt(0, help="Int value", sync=True) 
     disabled = Bool(False, help="Enable or disable user changes", sync=True)
     description = Unicode(help="Description of the value this widget represents", sync=True)
diff --git a/IPython/html/widgets/widget_selectioncontainer.py b/IPython/html/widgets/widget_selectioncontainer.py
index d20dcadbc..77416dbc2 100644
--- a/IPython/html/widgets/widget_selectioncontainer.py
+++ b/IPython/html/widgets/widget_selectioncontainer.py
@@ -15,7 +15,7 @@ pages.
 # Imports
 #-----------------------------------------------------------------------------
 from .widget import DOMWidget
-from IPython.utils.traitlets import Unicode, Dict, Int, List, Instance
+from IPython.utils.traitlets import Unicode, Dict, CInt, List, Instance
 
 #-----------------------------------------------------------------------------
 # Classes
@@ -25,7 +25,7 @@ class AccordionWidget(DOMWidget):
 
     # Keys
     _titles = Dict(help="Titles of the pages", sync=True)
-    selected_index = Int(0, sync=True)
+    selected_index = CInt(0, sync=True)
 
     children = List(Instance(DOMWidget), sync=True)
 
diff --git a/IPython/html/widgets/widget_string.py b/IPython/html/widgets/widget_string.py
index b35f47940..cb1d3774d 100644
--- a/IPython/html/widgets/widget_string.py
+++ b/IPython/html/widgets/widget_string.py
@@ -17,7 +17,7 @@ import inspect
 import types
 
 from .widget import DOMWidget
-from IPython.utils.traitlets import Unicode, Bool, List, Int
+from IPython.utils.traitlets import Unicode, Bool, List
 
 #-----------------------------------------------------------------------------
 # Classes