1 files changed, 2 insertions, 0 deletions
diff --git a/lib/gitlab/asciidoc.rb b/lib/gitlab/asciidoc.rb
index 2fac76d03e8..5cacd7e5983 100644
--- a/lib/gitlab/asciidoc.rb
+++ b/lib/gitlab/asciidoc.rb
@@ -4,6 +4,7 @@ require 'asciidoctor'
 require 'asciidoctor-plantuml'
 require 'asciidoctor/extensions'
 require 'gitlab/asciidoc/html5_converter'
+require 'gitlab/asciidoc/mermaid_block_processor'
 require 'gitlab/asciidoc/syntax_highlighter/html_pipeline_adapter'
 
 module Gitlab
@@ -46,6 +47,7 @@ module Gitlab
     def self.render(input, context)
       extensions = proc do
         include_processor ::Gitlab::Asciidoc::IncludeProcessor.new(context)
+        block ::Gitlab::Asciidoc::MermaidBlockProcessor
       end
 
       extra_attrs = path_attrs(context[:requested_path])