diff --git a/lib/hook_runner.rb b/lib/hook_runner.rb
index <HASH>..<HASH> 100755
--- a/lib/hook_runner.rb
+++ b/lib/hook_runner.rb
@@ -2,7 +2,7 @@
 require 'pathname'
 
 unless File.symlink?(__FILE__)
-  STDERR.puts "This file is not meant to be called directly."
+  STDERR.puts 'This file is not meant to be called directly.'
   exit 2
 end
Convert double to single quotes

For speed.

Change-Id: I7d<I>a<I>be4b0f<I>fa8cf<I>c<I>b5
Reviewed-on: <URL>