diff --git a/doc-src/lib/stylesheets.rb b/doc-src/lib/stylesheets.rb
index c2df6354..4e668010 100644
--- a/doc-src/lib/stylesheets.rb
+++ b/doc-src/lib/stylesheets.rb
@@ -138,7 +138,7 @@ def constants(item)
 end
 
 def mixin_signature(mixin, format = :html)
-  mixin.sass_signature(:include, format)
+  mixin.sass_signature(:none, format)
 end
 
 def example_items