diff --git a/debian/patches/895871-markdown.patch b/debian/patches/895871-markdown.patch
new file mode 100644
index 0000000000..190736718d
--- /dev/null
+++ b/debian/patches/895871-markdown.patch
@@ -0,0 +1,20 @@
+Last-Update: 2018-04-17
+Forwarded: [TODO]
+Bug-Debian: https://bugs.debian.org/895871
+Bug-Upstream: [TODO]
+Author: Dmitry Smirnov <onlyjob@debian.org>
+Description: fix markdown rendering.
+
+--- a/lib/banzai/renderer/redcarpet/html.rb
++++ b/lib/banzai/renderer/redcarpet/html.rb
+@@ -5,9 +5,9 @@
+         def block_code(code, lang)
+           lang_attr = lang ? %Q{ lang="#{lang}"} : ''
+ 
+           "\n<pre>" \
+-            "<code#{lang_attr}>#{html_escape(code)}</code>" \
++            "<code#{lang_attr}>#{ERB::Util.html_escape(code)}</code>" \
+           "</pre>"
+         end
+       end
+     end
diff --git a/debian/patches/series b/debian/patches/series
index 04cc24eb06..07d1679d1a 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -1,3 +1,4 @@
+895871-markdown.patch
 0050-relax-stable-libs.patch
 0100-remove-development-test.patch
 0108-make-mysql-optional.patch