diff --git a/README.md b/README.md
index d55cc214..0c6bdc17 100644
--- a/README.md
+++ b/README.md
@@ -63,5 +63,5 @@ These ruby gems are required to build the website:
 * jekyll
 * json
 * aquarium
+* less
 
-Additionally, ```lessc``` is required (in ```$PATH```).
diff --git a/_plugins/less.rb b/_plugins/less.rb
index 53bdb05d..97c4a36c 100644
--- a/_plugins/less.rb
+++ b/_plugins/less.rb
@@ -31,7 +31,7 @@ module Jekyll
         choices = Dir['**/*'].reject { |x| File.symlink?(x) }
         if choices.include?(@file)
           source = File.read(@file)
-          f = IO.popen("lessc", "w+")
+          f = IO.popen("lessc -", "w+")
           f.write(source)
           f.close_write()