diff --git a/chapters/strings/trimming-whitespace-from-a-string.md b/chapters/strings/trimming-whitespace-from-a-string.md
index bb0ddc6..e7e9ecd 100644
--- a/chapters/strings/trimming-whitespace-from-a-string.md
+++ b/chapters/strings/trimming-whitespace-from-a-string.md
@@ -39,7 +39,7 @@ Opera, Firefox and Chrome all have a native string prototype `trim` method, and
 {% highlight coffeescript %}
 unless String::trim then String::trim = -> @replace /^\s+|\s+$/g, ""
 
-"  padded string  ".trim
+"  padded string  ".trim()
 # => 'padded string'
 {% endhighlight %}