diff --git a/src/editor-component.coffee b/src/editor-component.coffee
index 75cb2031b..fe1b6d0af 100644
--- a/src/editor-component.coffee
+++ b/src/editor-component.coffee
@@ -70,7 +70,7 @@ EditorComponent = React.createClass
     div className: className, style: {fontSize, lineHeight, fontFamily}, tabIndex: -1,
       GutterComponent {
         ref: 'gutter', editor, renderedRowRange, maxLineNumberDigits,
-        scrollTop, scrollHeight, lineHeight, lineHeightInPixels, fontSize, fontFamily,
+        scrollTop, scrollHeight, lineHeight, lineHeightInPixels, defaultCharWidth,
         @pendingChanges, onWidthChanged: @onGutterWidthChanged, mouseWheelScreenRow
       }
 
diff --git a/src/gutter-component.coffee b/src/gutter-component.coffee
index 22d9b224a..3e8ec8048 100644
--- a/src/gutter-component.coffee
+++ b/src/gutter-component.coffee
@@ -34,7 +34,7 @@ GutterComponent = React.createClass
   # visible row range.
   shouldComponentUpdate: (newProps) ->
     return true unless isEqualForProperties(newProps, @props,
-      'renderedRowRange', 'scrollTop', 'lineHeightInPixels', 'fontSize',
+      'renderedRowRange', 'scrollTop', 'lineHeightInPixels', 'defaultCharWidth',
       'mouseWheelScreenRow'
     )
 
@@ -49,7 +49,7 @@ GutterComponent = React.createClass
       @updateDummyLineNumber()
       @removeLineNumberNodes()
 
-    @measureWidth() unless @lastMeasuredWidth? and isEqualForProperties(oldProps, @props, 'maxLineNumberDigits', 'fontSize', 'fontFamily')
+    @measureWidth() unless @lastMeasuredWidth? and isEqualForProperties(oldProps, @props, 'maxLineNumberDigits', 'defaultCharWidth')
     @clearScreenRowCaches() unless oldProps.lineHeightInPixels is @props.lineHeightInPixels
     @updateLineNumbers()