diff --git a/spec/text-buffer-spec.coffee b/spec/text-buffer-spec.coffee
index b818840ee..f822b37cc 100644
--- a/spec/text-buffer-spec.coffee
+++ b/spec/text-buffer-spec.coffee
@@ -432,7 +432,7 @@ describe 'TextBuffer', ->
         expect(event.newText).toBe "foo\nbar"
 
     it "allows a 'changed' event handler to safely undo the change", ->
-      buffer.one 'changed', -> buffer.undo()
+      buffer.once 'changed', -> buffer.undo()
       buffer.change([0, 0], "hello")
       expect(buffer.lineForRow(0)).toBe "var quicksort = function () {"
 
diff --git a/src/atom.coffee b/src/atom.coffee
index a14a339a7..7c4c12196 100644
--- a/src/atom.coffee
+++ b/src/atom.coffee
@@ -1,6 +1,5 @@
 #TODO remove once all packages have been updated
 {Emitter} = require 'emissary'
-Emitter::one = (args...) -> @once(args...)
 Emitter::trigger = (args...) -> @emit(args...)
 
 #TODO remove once all packages have been updated