diff --git a/src/app/editor.coffee b/src/app/editor.coffee
index bdd25ba67..9a6710d8e 100644
--- a/src/app/editor.coffee
+++ b/src/app/editor.coffee
@@ -19,7 +19,7 @@ class Editor extends View
     autosave: false
     autoIndent: true
     autoIndentOnPaste: false
-    nonWordCharacters: "./\()\"’-:,.;<>~!@#$%^&*|+=[]{}`~?"
+    nonWordCharacters: "./\()\"’-_:,.;<>~!@#$%^&*|+=[]{}`~?"
 
   @content: (params) ->
     @div class: @classes(params), tabindex: -1, =>