diff --git a/lib/rocco.rb b/lib/rocco.rb
index f3d96d0..2e7fb34 100644
--- a/lib/rocco.rb
+++ b/lib/rocco.rb
@@ -52,7 +52,8 @@ require 'net/http'
 
 # Code is run through [Pygments](http://pygments.org/) for syntax
 # highlighting. If it's not installed, locally, use a webservice.
-if `which pygmentize`.blank?
+include FileTest
+if !ENV['PATH'].split(':').any? { |dir| executable?("#{dir}/pygmentize") }
   warn "WARNING: Pygments not found. Using webservice."
 end
 
@@ -166,10 +167,10 @@ class Rocco
     # `pygmentize(1)` or <http://pygments.appspot.com>
     code_stream = code_blocks.join("\n\n#{@options[:comment_chars]} DIVIDER\n\n")
 
-    if `which pygmentize`.blank?
-      code_html = highlight_webservice(code_stream)
-    else 
+    if ENV['PATH'].split(':').any? { |dir| executable?("#{dir}/pygmentize") }
       code_html = highlight_pygmentize(code_stream)
+    else 
+      code_html = highlight_webservice(code_stream)
     end
 
     # Do some post-processing on the pygments output to split things back