diff --git a/lib/govuk_tech_docs.rb b/lib/govuk_tech_docs.rb
index 1c80e161..9292da2b 100644
--- a/lib/govuk_tech_docs.rb
+++ b/lib/govuk_tech_docs.rb
@@ -29,7 +29,6 @@ module GovukTechDocs
   # @option options [Hash] livereload Options to pass to the `livereload`
   #   extension. Hash with symbols as keys.
   def self.configure(context, options = {})
-    context.activate :autoprefixer
     context.activate :sprockets
     context.activate :syntax
 
@@ -52,6 +51,7 @@ def self.configure(context, options = {})
     end
 
     context.configure :build do
+      activate :autoprefixer
       activate :minify_css
       activate :minify_javascript
     end